iPad PDF Annotations Lose Opacity after Synching to Desktop

I have been annotating my PDFs on my iPad at an opacity of 33% using the “line” feature of the “oval/square” tool. once i exit and synch EndNote, I open the PDF on my desktop and all of the annotations are solid (100% opacity), redering the highlighted section unreadable. What is the setting/viewing fix for this? I’d hate to lose the hours and hours spent annotating.

Thanks in advance.

I just checked on EndNote Online, and the PDF has NO annotations.