Bots breaking after using CC

I tend to play a lot of bot games, mostly intermediate and in the latest games, about the last 3 days, I noticed the bots breaking whenever you use cc on them. They will either stop moving or won't use abilities anymore. Some retreat to base when getting low, some just stand there waiting for their death. This occurred mostly to top lane champions like Darius, Warwick and Amumu, but also to Alistar and Karthus. Since bot games are pretty important for learning this should maybe be investigated. However, it has not happened in every bot game, but in the majority of it. Not sure about beginner bots. This has been confirmed by several friends I've played with.