Hm, after further testing, I noticed that this happens in Opera too. Definitively a serious problem that we need to investigate. I am suspecting that an entire DIV tag is set to be clickable, but that tag happens to be several pixels larger than it should, on the left.
I am unsure how well this can be fixed, but it would definitively help to at least lower the width so that the clickable area only fills the text/icon area. We also plan to move the buttons farther than quote/modify in the future, because in mobile mode they are quite close.