Player contracts are not accurate

Players in real life who are signed to a club with a loan with obligation to buy are simply on loan and at the end of the season when you expect the transfer to become permanent they go back to the parent club and have 0 interest in resigning. E.g. In real life marmoush is on loan at Tottenham with an obligation to buy, he returned to Man City at the end of season 1 and even if you want to sign him back he has 0 interest in joining