check to see if your Caps Lock is on. Button controls the walk and run feature

My guess would be your armour. I think there is a perk that makes your heavy armour while your a wearing it weigh nothing. So when you start up the save the game has to load in the perk. I recon when you unequipped one of the pieces of armour your max carry weight will drop.

I hope that makes sense i suck at explaining stuff

i wacth the hole vid i dont under stand waht ask help for