I took a look at your file. Your occlusion for the stand was too tight, so the holdout was ineffective. Your shape around the poster did not include the doorframe, which it should have, for extra stability in the track, basically the more pixels you can give a texture tracker the better and in this case, the back of the poster texture became too light at the end of the shot to not need the door frame. At the end of your shot a very large flare comes over the top of the tracking area, making it a bit unstable. That’s an occlusion. Not all occlusions are opaque, sometimes light, reflections, and shadows are occlusions. This is especially a problem where glass is involved like this shot.
I took your file and moved your shapes into another folder, and added my own. I did have to use adjust track at the end of the shot to account for the flare. It was just not worth continuing to troubleshoot the track at that point. Sometimes, on shots where the track has major occlusions, some hand correction will be necessary.
Check your email for the Mocha file and let me know if it works for you!
Have a great day,