Massive amount of player bots in bot matches?

Over the past few days I've noticed a lot of bot games I join have bots on our team. They always go mid, have a few scripted responses like "gj" and "push" and always do terribly. Just now I played a bot game where 3/5 players on our team were bots. It's incredibly annoying when you're trying to practice a new champion and these things mess everyone up. I feel like this has only just recently started happening, anyone know more about what's going on?