thank you for the replies. I had a wrong note in the second ending and when I came to the right note further along it was trying to tie it to the note just before the special endings. So it was sort of a hanging tie.
I am entering a previously composed score into noteworthy in order to learn my part, the score comes to a point where there is a master repeat with two special endings and another repeat right after the second ending. This repeat has two measures. I get to the second to last note of the second measure and a tie automatically appears coming from the note and going backward to the second special ending. The two notes are not the same, I have not selected tie or slur, I've highlighted all notes and the slur or tie icon button do not show as selected, I can put the note anywhere else (up or down) on the staff and the tie goes away but if I put the note on the staff where it belongs I get this tie no matter what I do. Can anyone help?