That looks like a Linux-specific rendering issue - it certainly looks nothing like that for me.
Not that I'm saying that it's OK for them to ignore the problem, but the issue you're seeing is not experienced by almost all users.
What browser version are you using?
https://plus.google.com/106938703242944328523/posts/AU5F7oeV...
I have added red marks to the screenshot, so it's bit easier to find those buttons.