Motion Blur when moving camera

It seems that I’ve been having this issue for some time wasn’t there a few versions ago. The thing is it’s been so long I don’t exactly remember when it started popping up. But it came with one the Engine Version update.

Does anybody have any idea what causes this? When my camera move or rotate , it totally blurred out everything. It definitely it’s caused by motion blur because it goes away when i uncheck motion blur in the global settings. Note that I did not set up any motion blur anywhere. A lot of our codes are copied paste from earlier ShooterGame though.

Also I unchecked the PerBone Motion Blur from all skeleton ( 1P and 3P ) in my blueprint component and this is still happening. Any idea?