It's would appear to be browser-dependent. Using Chrome, I have no issues with the home page. In the photography thread, when it first began, I appeared normal. The second time I viewed the thread, they were forever more large, and the whole page remained large, requiring scrolling to see the page advance. So maybe check for software updates on the morning of 1/29. Once advanced to the second page, it was normal. I added an attached photo to my post on the second page, and it can be enlarged at will without affecting the whole page. So it seems to be an affect with in-line images.
"Kitchen duty is awarded only to those of manifest excellence..." - The Master, Dogen