every single time i jump dont really land. i just glide overs stuff like im on ice
It's a character position issue, Check out Slipcor's little save fixer over at http://mlbs.slipcor.net/ get one of the last two and reset character position. - This should fix it for you.
It occurs (for now) when you start and stop being on ground in odd ways - Swimming sorta, toggles that effect off and on as it tells the game "You've gotten in water" and "you've gotten out of water" so to say - but anywhere else - and there's nothing to do that......
....
I.e - The Cart. Don't ride the cart, really, If you get thrown off it or even if you just ride it uneventfully, you can break a lot of things. - Most commonly it seems more connected (or more noticeable) with going over uneven surfaces that may cause the cart to freak out even slightly
Some surfaces of course REALLY freak it out, and send it off to the cosmos.
Your level sheet probably also is off-set because of your character issue, the Save-game fixer should fix that too.