The following you could have seen in this question (sorry, I've commented there, so you won't see it anymore) in Chrome 35.0.1916.153 m (current version). Notice how the add comment link overlaps the bounty box:
The same you can observe with a comment box on other sites, e.g. at this time in this question:
Could you shift it a bit down ?
It seems that it happens on more than just Stack Overflow (maybe all sites ?).