yeah, i did wonder about this the first time i saw the designs without the whole thing running along the bottom, 'cos i saw someone jumping on them, and it bending in the wrong place, and giving nothing like the height you could get elsewhere, however i figured they'd fixed that issue, as i havent seen exo's bend in the same way, i think it's just bad luck mate, but if you have the same problem again, or if others do, it might be worth addressing.