I have seen this issue before and have looked all over for the answer but can't find it . We create a etherchannel on 4 ports with the exact same config line for line , we bring up the channel 3 show say in port channel 150 and the 4th ends up int 150A . We find no issue on our end everything is line for line . We are thinking the issue is with the server like they have 3 nics teamed right and the 4th is not included in that team . What causes the extra psuedo etherchannel in the group ????
I have seen this on some of our switches. It is not confined to CatOS switches.
It does not generate any real issue.
The answer that has been reported in the forums is that for some reasons the link members under for example 150A had one minor difference at the moment of forming the bundle.
Hope to help