Still testing positive over 2 years later

Two years ago I had this psychiatrist inject 3-300 shots at once of sublocade. I can still feel the reservoir depot in my stomach it’s about the size of a pea still. I’m on methadone now and I was denied take homes because I’m still testing positive for bupenorphine. The thing is it’s going in and out of my system. One month it won’t be there the next month it will. No one at the clinic believes me about the sublocade shot being the culprit. I explained to them that if I was taking Suboxone I would throw myself into precipitated withdrawal, there’s no reason why I would be taking bupe. Does anyone have any experience with the sublocade shot staying in your system for this long?