四个端口聚合后为什么每个端口负载相差很大

原来是三个端口聚合每个端口都接近99%负载，现在追加一个，但查看发现第一个端口还是那么大，其它几个就没有那么大，特别是最后一个追加的端口负载最少，请问这是什么原因？是属正常吗？

查看流量内容如下：

交换机1：

<S7006E>display counters rate outbound interface Bridge-Aggregation 5

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

BAGG5                       79        311672                --                --

 Overflow: More than 14 digits.

       --: Not supported.

<S7006E>display counters rate outbound interface GigabitEthernet 2/0/19

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE2/0/19                    99         88728                --                --

 Overflow: More than 14 digits.

       --: Not supported.

<S7006E>display counters rate outbound interface GigabitEthernet 2/0/20

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE2/0/20                    72         78590                --                --

 Overflow: More than 14 digits.

       --: Not supported.

<S7006E>display counters rate outbound interface GigabitEthernet 2/0/21

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE2/0/21                    84         81994                --                --

 Overflow: More than 14 digits.

       --: Not supported.

<S7006E>display counters rate outbound interface GigabitEthernet 2/0/22

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE2/0/22                    59         62547                --                --

 Overflow: More than 14 digits.

       --: Not supported.

交换机2： 

<S7003E>display counters rate inbound interface Bridge-Aggregation 1

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

BAGG1                       78        310687                --                --

 Overflow: More than 14 digits.

       --: Not supported.  

<S7003E>display counters rate inbound interface GigabitEthernet 0/0/1

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE0/0/1                     99         88720                --                --

 Overflow: More than 14 digits.

       --: Not supported.

<S7003E>display counters rate inbound interface GigabitEthernet 0/0/2

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE0/0/2                     72         78656                --                --

 Overflow: More than 14 digits.

       --: Not supported.

<S7003E>display counters rate inbound interface GigabitEthernet 0/0/3

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE0/0/3                     84         81913                --                --

 Overflow: More than 14 digits.

       --: Not supported.

<S7003E>display counters rate inbound interface GigabitEthernet 0/0/4

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

GE0/0/4                     58         61573                --                --

 Overflow: More than 14 digits.

       --: Not supported.