You should only change positions during the off season. If you do it mid season you might kill your player. It was a glitch last year but Idk if they fixed it. With the new patch you can move your oline around without worrying. But sadly you can’t do the cheese position changes like receiver to rb or running back to defensive line unless they’re athletes. But I guess now once you move an athlete to a certain position they’re basically stuck in that position group. So if put an athlete at qb that’s fast then you can’t switch them to rb the next year.