I got a bargain Phil and Teds Sport second hand yesterday but it seems to have a bit of give in the frame. When ds sits in it, it seems fine, it's far more noticeable when it's empty, if I lift it by the handle the back wheels swing forward a tiny bit if that makes sense. I wondered if that's normal? I know our Bugaboo has quite a lot of give in the frame (for suspension I suppose?) but because the baby is meant to go in the underneath bit of the Phil and Teds it's making me a bit nervous, I don't want the whole thing to collapse if he's in there. If it's normal then I can relax. If it's not, is it worth trying to tighten the bolts at the folding part or is it completely knackered?