两台楼层交换机与PC端的神奇纠缠

问题是这样的，我公司楼层交换机由H3C S3100组建而成，现在出现了一个奇怪的问题，本来S4交换机是为4楼PC分配地址进行交换任务的，S9交换机是为9楼PC端分配的，现在S4交换交换机11口的线插上，9楼的办公室可以上网，但是7楼这个办公室对应的S9交换机15口也必须插上，如果把S4交换机11口的线拔掉，9楼的这个办公室就不能上网了，把S9交换机的15口线拔掉，这个办公室也不能上网了，而且办公楼的所有PC端都是192.168.20段的地址，突然有一天，9楼的这个办公室就变成192.168.1段的地址了，请问大佬们谁知道这是怎么回事呢？怎么能处理一下且不影响上网呢？  

交换机配置如下，两台交换机配置相同：

[Internet-S4]dis cu !Software Version V200R011C10SPC600 # sysname Internet-S4 # vlan batch 20 100 110 # authentication-profile name default_authen_profile authentication-profile name dot1x_authen_profile dot1x-access-profile dot1x_access_profile authentication-profile name mac_authen_profile authentication-profile name portal_authen_profile authentication-profile name dot1xmac_authen_profile authentication-profile name multi_authen_profile # arp anti-attack packet-check sender-mac dst-mac # dhcp enable # radius-server template default radius-server template default_mould radius-server shared-key cipher %^%#&b#LTj^CJ@I=%w'>uh%;3g\e0_K#|LMSdE6+v8pV%^%# radius-server authentication 192.168.10.2 1812 weight 80 # pki realm default certificate-check none # free-rule-template name default_free_rule # portal-access-profile name portal_access_profile # vlan 20 description This vlan Access Internet vlan 110 description This vlan used to manage device # aaa authentication-scheme default authentication-scheme radius authentication-mode radius authentication-scheme default_radius authentication-mode radius authorization-scheme default accounting-scheme default local-aaa-user password policy administrator password history record number 0 password expire 0 domain default authentication-scheme default_radius radius-server default_mould domain default_admin authentication-scheme default local-user admin password irreversible-cipher $1a$NLSn&tSty>$Zb';=9h&o;W]OwCQx\*(lV""K`PC;TXRA|Q#1v0V$ local-user admin privilege level 15 local-user admin service-type terminal http # interface Vlanif20 ip address 192.168.20.204 255.255.255.0 # interface Vlanif110 ip address 192.168.200.21 255.255.255.0 # interface GigabitEthernet0/0/1 port link-type access port default vlan 20 loopback-detect enable # interface GigabitEthernet0/0/2 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/3 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/4 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/5 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/6 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/7 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/8 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/9 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/10 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/11 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/12 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/13 port link-type access port default vlan 20 loopback-detect enable # interface GigabitEthernet0/0/14 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/15 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/16 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/17 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/18 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/19 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/20 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/21 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/22 port link-type access port default vlan 20 loopback-detect enable authentication-profile dot1x_authen_profile # interface GigabitEthernet0/0/23 port link-type access port default vlan 20 loopback-detect enable # interface GigabitEthernet0/0/24 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 20 110 # interface GigabitEthernet0/0/25 loopback-detect enable # interface GigabitEthernet0/0/26 loopback-detect enable # interface GigabitEthernet0/0/27 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 20 110 loopback-detect enable # interface GigabitEthernet0/0/28 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 20 110 loopback-detect enable # interface NULL0 # ip route-static 0.0.0.0 0.0.0.0 192.168.20.1 # user-interface con 0 authentication-mode aaa user-interface vty 0 4 user-interface vty 16 20 # dot1x-access-profile name dot1x_access_profile # mac-access-profile name mac_access_profile # return