Guitar : Objects (trem dips) change places when opening the file after saving

Hi , I'm sure many people have experience this.

I place some trem dips over notes and tabs in a careful way and I save my file.
When I open the file, the dips are all over the place, all misplaced.

I joined the before and after screenshots

Thanx for helping,im stuck and loosing some precious work time.

Dan