Accidental appearing on trill for no reason

On this E half sharp, it should be a trill to F as the key signature reflects F minor, but the trill has an accidental above.
If I go into settings of the trill and change the accidental to always show accidental and then to show any alteration, it removes it but when I save, close and reopen, the accidental is back! How can I fix this so that it does not show up?