I think I remember a post elsewhere on this forum that mentions the AI with the DLC. I can't be sure, but I think that during qualifying, if you want to skip the rest of qualifying, your should use the 'time advance' method to speed up time, don't use the skip to next session (skip to race?).
I think it was mentioned that the AI lose their 'driving level' and don't race to their Quali standard. Meaning that they race to a higher level than they qualified ......
I think that was the gist of what the thread said, but it was a long time ago when I read it ......
EDIT: Having read this again, it sounds like I am talking about an old F1 2011 bug, but somehow I have this nagging feeling that Alex (Reiza) posted about this ......