i actually can help you with this, its not a glitch or a bug its actually just a really **bleep** game mechanic. Some coaches in the game have the ability to randomly unlock previously/otherwise locked tiers. So what you have to do is put on max XP, freshman difficulty and just grind for as much xp as you can. every skill point you buy has a random chance to unlock one of your locked tiers. you can look up which coaches do this. Its a real pain in the **bleep** and there is also the possibility the coach will leave after your first year and you wont be able to actually tell until you've already committed to the same school. thats why i recommend the xp farming for the first year.
