3D tracking error - drifting track points

ok here we go...I am tyring to track a shot without very good tracking points. However, I have succesfully tracked this shot in the past, taken the tracking data and created a camera in Blender. For some reason this time it isnt working. When I scroll through the clip looking at the markers, they all seem to synchronisingly drift in a way the actual camera is not. Never seen this before. Then when I tried to take a decent track into blender to see if I could get away with the slightest movement, the camera motion was all over the place. I create a solid with the camera in AE and depending on the markers, its not too bad (although not solid as it was a few months ago.) Anyhow, the movement of the solid is only slightly off compared to the crazy camera i create in blender with the corresponding tracker info. Ive tried lots of different tracking combos for solving but nothing seems to work. So bc ive done it before I know its possible as the video will show, and this problem doesnt even seem related to the poor quality tracking points.  Any ideas??? Ty!

attached is the shot succesfully tracked and with a jet animation composited AND a screen recording of the timelines from both AE and then Blender of the problem.