Discussed somewhat here. Images, or any other floated elements, can potentially spill out of their containing elements if they aren't given enough vertical space to be contained within. Images are initially set to float in the RTE, so storygame descriptions (and posts, but less so) have a decent chance of causing this issue when viewed in the subsections on the profile.
These sections are all separated with hr elements, so simply adding the CSS property clear: both; to each hr would prevent the problem.
Didn't notice this one.