This is because you can't have the hoverboots on (technically u you can but it requires this dumb jumpslash. Therefore, either take them off before you land on the seam and don't roll until you're trying to get on the arm or on the final roll to the arm to a quick unequip (hit hover boots on the frame frame you hit A to rill)
thanks ben, i wasnt doing the quick equip, works nicely.