I noticed a bug/problem with a certain type of ad that appears on Stack Overflow. This occurs on Firefox, Google Chrome, and Internet Explorer, but I am not sure of any others.
Here are two different ads from Firefox and Google Chrome (Internet Explorer is like the second one, but not as bad):
As you may or may not see, the tags under the job descriptions are too high up, cutting off the caption above a little. It only seems to occur with ads of this type.
Also, with the second ad, it seems like text is cut off at the left. The thrid ad is also from Firefox, about a day later.