Upcoming retraction surgery - should I be concerned about it failing? (photos)

I have a second eyelid retraction surgery in the next few months. After the first surgery, my eyelids showed severe retraction within 2 months post op. I have weaker cheek bones and prominent eyes. My surgeon used Acelluar demal matrix graft/spacer and plans on using it again second operation but my question is if they retracted the first time quickly, what are the chances that they wont retract again after the second surgery? Is it maybe the wrong choice of graft material and maybe hard palate?