I figured out what was going on; it was some weird interaction with an extension I had called Super Full Feeds for Google Reader. Not sure why it was happening, the extension should only interact with Google Reader, but once I disabled it the bug stopped.

I'm out of town this weekend so I can't check what version of Chrome I'm running (writing this from my phone). I'll check when I get home. The icons I'm referring to are the formatting icons that appear over the new comment box. The bold, italic and underline icons appear fine, but then the game icons just keep repeating themselves.

When viewing my decklist, the Comment box at the bottom of the page continuously adds the icons for the 3 card games for multiple rows. This really starts to bog the page down once it gets to the 30th+ row. I'm using Chrome. Anyone know how to stop this?