Bad gif example: https://gyazo.com/f4c37b3b0a7830dc67403653177bb5da
Looked a bit into it, looks like the problem lies here, lines 228-239 of forum.css:
.forum dl dd img {
width: 45%;
max-height: 680px;
box-shadow: 0 0 6px #447;
-webkit-box-shadow: 0 0 5px #445;
-moz-box-shadow: 0 0 5px #445;
transition: all 0.25s ease-in-out;
}
.forum dl dd img:hover {
width: unset;
max-width: 95%;
}
width: 45% should be changed to max-width: 45%, supposedly that should take care of it. Maybe. Probably.
Edit: line 193 too apparently, seems to be a copy of 228... whatever...
