The car mastery grid menu thing seems to have bugged out on me. I have unlocked the bottom 3 rows of a Legendary car ('69 Fairlady Z) and since then I can’t move the cursor to move between items there - the cursor is stuck at the top left item. Doesn’t affect other cars and problem persists between game restarts.
EDIT: Fixed it by using the mouse to click another item. Controller was able to move the cursor again correctly after that.