Pathfinder (Unite) change share a lot

Hello, I use Pathfinder in Illustrator CC and it changed shape a lot:

Before:

And after: (it distorts both shape and coordinates - moves all new object to whole (integer) pixel). 

"Snap to point" and "Snap to grid" are off. Pathfinder > Pathfinder options > Precision doesn't change anything.

What to do to fix this?