Through the season, I've played the add/drop game like it's fantasy football, trying to get the pieces I want for my team. It's worked out quite alright, but then for last game, I was looking at two players I wanted to test and then this happened.

Thankfully, it's just two backups (LDE 3/4 and CB5), but it left me thin for the last game, where I was trying to limit playtime for my starters.
Why did the AI all of a sudden cut my players? Through the season, I've just gotten the "You're above 53 players, cut some before next update or the AI will do it for you" message.