Confirmation:
Player is in prone stance.
Press ctrl + reverse (S) to adjust stance to 'prone lean right'.
By adding in a sidestep key (D) in quick succession, causes the player avatar to slide to the right.
It's easy to escape slide by adjusting stance up ctrl + forward (W)

Additional:
Sometimes occurs with 'Sniper Stance' but harder to reproduce.

This occurs in other stances. If you hold the Stance key, and quickly press+hold 2 movement keys(one left/right, one forward back) you will slide. High standing you will slide slow, anything else you appear to slide quickly.

I made a quick demo here:
http://youtu.be/j7FiFnU_8oA

I can confirm this for low-prone at least. Haven't tried the other variants yet.

I have this happening all the time when adjusting to the sitting stance one step above proning when on slopes.

Basically this issue should have proning removed from the name because it happens in a lot more situations than when proning.

I think this happens in all positions:
http://www.youtube.com/watch?v=AfTfSlTYPbs

Does this still happen in current stable?

Yes, confirmed in 0.54.103957.

Seconding that confirmation that the issue can be reproduced in 0.54.103957 by the described method.

Seems to be consistently reproducable in the latest builds.

Yes that's why I recorded the video as the issue is still in the latest Dev build. I'm loving the new stances though... :D

For me it only happens when I go from prone to sit prone. I always slide. Never happens when I go left or right prone positions. Sit prone is essential in some situations but 99 out of a 100 times I just slide instead of staying still.

Still happening in the Beta.

Found out it can happen in any stance: http://youtu.be/QItYIdtfjSU

I cannot reproduce, perhaps this is expired?

Oh yeah i noticed this once or twice too.

We need accurate repro steps and mission then.

Appears to be fixed now (unless not being able to do it has to do with rebinding some of my movement/stance keys).

Is this issue fix or does it still exist?

Haven't played the game in a long, long time, so couldn't say at this point. I also see the same bug in BF4 LOL

Appears fixed, have not had this happen in some time.

Marking fixed then.

Mass closing tickets marked as resolved more than 1 month ago.

If the issue is in fact not resolved, please create a new ticket referencing this one and ask for it to be re-opened.