ER POE eth2-eth4 reduced performance

The difference in routing performance on the POE unit based on port prompted me to switch to the Pro model router:

I get the following routing stats with iperf:

eth0-eth1:

Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.10.36, port 49452
[ 5] local 192.168.10.14 port 5201 connected to 192.168.10.36 port 49453
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 89.3 MBytes 749 Mbits/sec
[ 5] 1.00-2.00 sec 110 MBytes 923 Mbits/sec
[ 5] 2.00-3.00 sec 110 MBytes 919 Mbits/sec
[ 5] 3.00-4.00 sec 108 MBytes 907 Mbits/sec
[ 5] 4.00-5.00 sec 109 MBytes 915 Mbits/sec
[ 5] 5.00-6.00 sec 110 MBytes 920 Mbits/sec
[ 5] 6.00-7.00 sec 106 MBytes 886 Mbits/sec
[ 5] 7.00-8.00 sec 107 MBytes 898 Mbits/sec
[ 5] 8.00-9.00 sec 111 MBytes 930 Mbits/sec
[ 5] 9.00-10.00 sec 108 MBytes 903 Mbits/sec
[ 5] 10.00-10.19 sec 20.9 MBytes 914 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.19 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-10.19 sec 1.06 GBytes 895 Mbits/sec receiver

eth0-eth4:

Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.10.36, port 55074
[ 5] local 192.168.10.14 port 5201 connected to 192.168.10.36 port 55075
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 29.0 MBytes 243 Mbits/sec
[ 5] 1.00-2.00 sec 34.4 MBytes 289 Mbits/sec
[ 5] 2.00-3.00 sec 35.3 MBytes 296 Mbits/sec
[ 5] 3.00-4.00 sec 34.2 MBytes 287 Mbits/sec
[ 5] 4.00-5.00 sec 32.9 MBytes 276 Mbits/sec
[ 5] 5.00-6.00 sec 35.9 MBytes 301 Mbits/sec
[ 5] 6.00-7.00 sec 35.3 MBytes 296 Mbits/sec
[ 5] 7.00-8.00 sec 36.0 MBytes 302 Mbits/sec
[ 5] 8.00-9.00 sec 35.5 MBytes 298 Mbits/sec
[ 5] 9.00-10.00 sec 35.7 MBytes 300 Mbits/sec
[ 5] 10.00-10.18 sec 6.47 MBytes 296 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.18 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-10.18 sec 351 MBytes 289 Mbits/sec receiver

Configuration was identical, just swapped ports on the ERPOE unit.

Is this expected?