I don't know if its a bug in adsense system or what, but I have all of my adsense fonts set to the default, but every once in a while, when I refresh my site they change to a different font, Times New Roman, etc... I wonder if this is affecting clicks at all? Anyone else experiencing the same?
All seems fine on my end, maybe your site's CSS sets a default font for the pages, otherwise it could be your web browser.