Hi,
The problem seems to be caused by the floated div used in combination with the jqueryui stuff that you are using. When I use Chrome browser tools to inspect the element, if I remove the float from the container div it solves the problem.
I would try adding this at the very bottom of your css below the .floatpanel rule.
.site-statistics.floatpanel { float:none; }
Hope that helps and thanks for the coffees!
Best,
Joe