I have had both ankles operated on for Posterior tibial tendonitis. I have plates and screws in both feet. My right was done by a Doctor who retired.I've never had a problem with it.
My left, however, has been a problem.Because they only put the graph in with a staple instead of using a plate and screws.So I had to have revision surgery to correct that problem.

I suggest that you go to the doctor a new doctor and find out if your hardware is still okay.
Good luck God Bless