I can confirm this.
It happens if you press cover/crouch while running forward.
However, if you stop before cover, the bug seems not to happen.
It also occurs even when standing still. Oddly the animation is alot slower too, but only sometimes, and its not universal.
Was in a flashpoint where sometimes i would go into cover nice and quick and proper, and other times i'd get the slow animation.
Oh well... i'll be in DF till it gets fixed.