Having a bit of an issue, curious if anyone knows whats going on.

-I've been trying to limit break jormungandr from 3 stars to 4 stars
-I have a 0 star jormungandr that is not locked in my inventory
-The 3 star one doesnt recognize that there exists one that is suitable to use to limit break
-The 0 star one is able to use the 3 star one to limit break
-Neither of them are currently equipped
-I have sufficient gems for the upgrade