The problem with marlin

HI
gathered sla printer firmware sprinter
works perfectly but with ps
 decided to install marlin, hooked RepRapDiscount Smart Controller
and run the code from the card
BUT
MARLIN buggy threw
test cube 10x10x10
runs away on X and Y , in Y about 3mm x 1mm to 10mm in height
the speed and acceleration are the same as in sprinter
returned firmware SPRINTER. checked that no problem , everything is perfect
returned MARLIN there are problems
motors not, to say losing a step
board is fully separated from the printer optocouplers . Only minus total
all signal cables are shielded , the inputs ferrites
I think not in the iron problem ,, MARLIN buggy, except of steps still what that throws garbage
here is a video
www.youtube.com/watch?v=yv9Gj8nbedw&feature=youtu.be

which will offer
What's the problem?

Elshad