I just looked at it with IE6 and seems you've fixed it already.
Two general tips:
make sure that the width of the form doesn't surpass the width of the sidebar (in both normal state and when invalid state), otherwise CSS / UI issues may be the result
don't just leave away field labels, if you'd like to not show them set their ID's via CSS to not display (make sure you have ID's for labels enabled under cforms->styling).