Can't upvote or downvote on android devices

Hi there,

I can't upvote or downvote on my android htc incredible or my nexus 7 tablet. The images for the arrows are wrong and when I click on them, nothing happens. However today I realized this is ONLY when I view the "mobile" version. The "original" version/view seems to be fine.  Any help for this? It's been like this for weeks. Thank you.