I am not sure what the problem is but it isn't Posting Photos. A better description would be "invasive Ads", in my opinion. Regardless, I am pretty sure it is not the MOC. I have viewed your pictures with FireFox and Chome using ids that were not logged on, logged on, and using or not using Ad Blockers. No ads overlaying pictures. Here is a screenshot.
I lean towards a problem on your end.