The scenarios that this could happen in usually are one of these:
-You were not hired, but only have chosen to "Act as"
-Your manager has a high enough reputation to control lineups (and you don't have the legacy option selected)
-You are playing with the "Do Not Disturb" mode active
In all 3 cases the AI can control and change lineups. If it's not any of those, then we would suggest to at least post some screenshots, and would need you to upload your league files (
https://support.ootpdevelopments.com...p-developments) for us to investigate further.