Yeah, I have seen this as well. I still focus on my bigger issue of undesired talk group audio "bleedthru" but your post reminded me that I had also seen this issue and was going to bring it up but got busy and forgot about it. As I recall, recently when I was parked on the some other screen, heard a transmission that I was interested in and wanted to see the source, switched to the Talk Group Log and it was not updated with the TG just received (I remember knowing that the last TG in the log was definitely not what I had just heard).
System I monitor is a P25 system with mixed P1 and P2 talk groups. Parked on one CC but I sometimes roam between two others both on the same system but different sites. I can't remember if when I noticed this I was roaming or not but I think I was not in roam mode. I am trying to make sure that my talk group bleedthru issue is not dependent on roaming (doesn't appear to be) so have been just parked on one CC most of the time these days.
Hmm.
-Mike