Pisa Tower prints on Y axis

Hi there, i recently applied OS and hardware upgrade. So my VCore 500 runs under RatOs 2. I have changed XY motion system by Vcore 3.1 and BRS Tensionner. I also put a Hextrudort on a VZ head.
My problem is when i print a part it systematically comes out with a diagonale issue on the Y axis only when i print in layer by layer mode. But it comes very nice out when I print them in vase mode. I already made accel and speed test to be sure it do not comes from pulleys or coupling.