Google AdSense seems to be testing placing the ad choices arrow on the left top of the ads, instead of the top right of the ads.
A WebmasterWorld thread has complaints from some publishers, claiming the arrow, when positioned at the top left, covers part of the text in the ad itself. One AdSense publisher said:
Others are seeing this as well, but I am personally not able to replicate it on my own devices.
I photoshoped what they may see:
I wonder if this is a test or a bug with Google or the publisher’s own site?
Forum discussion at WebmasterWorld.
Update: Here is a screen shot showing the issue, and it does seem to be a bug:
