BOSCH stacked dr/wash – wash does not stay in place on spin

We have installed stackable washer and dryer in our closet . Washer legs are installed properly as in the user guide. However, everytime the washer starts to spin the machine starts trembling and moves out of its space to the point that we have to briefly turn it off. The problem exist even when the spinning program is set up for low. In effect we can not use final spinning program and the regular spin needs to be turn on low speed. Then washed clothes are still damp /sometimes soaking/ that requires double time to dry them.
The washer is installed on the hardwood floor, properly leveled and its leg are locked. What can we do to solve the problem and be able to use the machine without any limitation ❓