Hello everyone for some reason my site gets really large. The text in the sideboxes are out of the box because they are so large and so forth. The site is

http://www.wpc-consulting.com/~stxmill/

The weird thing is that it only happens on like slower internet or something. I haven't seen it happen on my PC at home once. But when I go on my laptop with the same internet browser on a slower internet and it really gets blown up. Has anyone seen this or know how to fix this. Any thoughts or suggestions?