I've seen few levels where in object/stones/rocks/Car Glasses doesn't fall down to ground.

Example:- Glass when hit a car doesn't fall down to the ground & they stay in mid air.
You can check by shooting the glass & then kick the car & voila - the glass is floating Though after few seconds it vanishes(just as programmed).
^Can be easily seen in Single Player. Didn't check in MP.

In MP-Maps like "Sanctuary" you can easily see that the papers, some rocks(meteor look) floats in the air & they NEVER fall down.

Is it a graphic driver issue ? or 1.9 Patch issue ??

Please reply if you also face the same.