Take a look at this post - Why is $\frac{987654321}{123456789} = 8.0000000729?!$. This is what I see (on Windows 7, Chrome 31):
As you can see, all sufficiently long comments are bleeding into the right column, and some of them are being hidden beneath the community ad for DLMF. Presumably, this is somehow being caused by the long, unbroken string of digits in the third visible comment there.
Update: this is still happening on Chrome 34.