Need some help

I'm currently building Lego 42177 Mercedes g 500 and I've run into a perplexing situation and looking for insight just got the wheels on and just seeing how it rolls and well the drivers back wheel does not move unless I turn it by hand. It does and doesn't bother me much(my Land Rover the back wheels just fall off kinda funny my wife built that one just to lazy to take it apart and fix it) it's going to be on display so won't really mess with anything but annoying none the less. I've check...