All the AI enter the pits, but not all stop in their stall. A few go by and back onto the track. Tested with GT1 through GT4 ISI cars, field of 25 at Silverstone, 10 lap race. At first, I thought it might be the class winners taking a victory lap (LOL) since the winner was one of the cars that didn't stop. Unfortunately, checking the class winners, they found their pit stalls, and it was random cars heading back out. [Build 590]
Which Silverstone layout? And was it the latest version of Silverstone? Did you have more AI than stalls?
I saw that happen at a few of the VLN tracks.... seems a quarter of the AI drivers didn't want to stop driving and this was with a maximum of 10 AI on our server.
Even saw this happen to at Limerock when I switched my car to the AI - few dudes and my car were circling around the track after end of race till I hit escape and left the track. (hope they stopped then )