Meta Pixel Double Firing, Catalogue Match Rate Not Right Either

My Metapixel is double firing I've tried everything from adding a deduplication script to lowering the share data level from maximum to enhanced. It's still picking up a server and a browser event for each event. Meta support isn't helping me. The product purchases are also not seemingly being picked up in catalogue matching. It's also telling me it's receiving content IDs that do not match any connected in the pixel. Please no time wasters I know what this site is like a lot of people apply without knowing what they're applying for. I need someone experienced because I know what I'm doing to a certain degree and I'm having no luck so whoever takes this on needs real experience. I also want to clarify I DO NOT need someone to manage my campaigns. I just need these issues fixing.