Fire and advance problem

Anyone using this feature?
I tested it and it seems the first rank shoots, second runs and shoot (as it should be!) and then they just both run back towards orignal place from where they started. Then the whole proces start again...

The first row that has shot first don't advance in front of second rank (that did advance)

Is this happening with anyone else?

And yes I know, Fire and advance isn't that useful

Target a specific unit; all ranks (however men you've drawn out) will fire once and then charge into melee.

Untargeted, it's useless. Units with a good charge bonus (Russians for example) make very good use of it with a specific target.

Thanks for reply, will test it out later

Check out this video (firing with fire-at-will) and the this to see how FAA works.
It does look like even when not selecting a target, FAA causes more casualties.