Solved
Arkansas State always plays ULM
When taking ULM out of the Sunbelt conference, no matter what they always play Arkansas State week 10 or 11. I encounted this last year and was hoping it would be fixed but it hasn't. I tested this with multiple settings. 9 conference games, Divisions or no divisions, protected opponents. Still locks Louisiana Monroe on Arkansas State's Schedule. This is the only team I've found this with but I image its an issue with multiple teams. I'll link pictures to my current dynasty.
That’s because they’re rivals, and this year, EA updated the switch conference feature to maintain the big yearly rivalry games even when you switch conferences.