I currently have no screenshot, but basically whenever I raid, the buffs will at some point clip into the debuffs (even with a pretty large number set per row), making it basically impossible to see what debuffs I have. (problematic on Thaddius for example).

Which World of Warcraft version (please complete the following information):

• Wotlk

Not a bug. Please move the Debuff frame further down if it's clipping into your buff frame. You can do that by pressing "Edit" in the SUI menu.