jQuery Forum

Your big black border is causing the boxes to be more than 700px wide (and same idea for height), meaning that a part is cut off. You should simply adjust the width of #homeGroup and related, so that it does take into account the border.

I usually try to ensure that every parent does have the dimensions of its combined children, so when I float an element then its parent needs some extra CSS aswell to ensure it still has proper size. This makes it much much easier to find bugs as these, and usually helps prevent them.