One of my jobs is running under an allocation group that is not mine!

Happened to me once. See this:

$ showq -r -u jmateos

...
30486658            R  gm-  93.14      1.2 no   jmateos eim-670-      sw-2r14-n14    12  1:16:49:28  Thu Apr 16 03:51:21
30486659            R  gm-  88.11      1.3 no   jmateos eim-670-      sw-2r15-n70    12  1:18:30:22  Thu Apr 16 05:32:15
30621080            R  gm-  91.52      1.0 no   jmateos  atlaspt      sw-2r14-n13    12  3:03:19:00  Thu Apr 16 14:20:53
...

Job number 30621080 seems to we running under allocation group atlaspt and not one of our own. I contacted guillimin support and they told me this:

This is an issue with our scheduler software that is only a cosmetic problem. The job 30621080 will be correctly charged to the account eim-670-aa. The 'group' parameter in the scheduler is distinct from one called 'account' which is the one used for accounting purposes. The group parameter is correct on the worker nodes, but gets confused at some point on the scheduler node. However, it will not affect your jobs.

So don't worry too much about this.