Chrome/Win 10.0.648.119 beta.
For some reason, if I open the developer tools and disable the .user-stats-table { overflow-x: hidden; }
rule, the scrollbar disappears.
Disabling the .fr { float: right; }
rule also makes the scrollbar go away, but it stays gone when I re-enable the rule.
Probably just some weirdness caused by running the beta version of a browser?
I should also note that this started appearing a few days ago, but I didn't bother posting until now.