Please help !!!!

We recently installed tiles in Laundry room. For that we moved washer and dryer and connected back. The problem started after we put it back, is water is draining well without any issue, when spin cycle starts the soap is coming out from the drain pipe. We called Maytaq service, they said run the washer with water, the soap in the pipes will go away, nothing worked.

The local home depot guy said there must be air lock in the vent pipe. I don't understand where is the vent pipe.
By the way we blown out the insulation in our attic, the guys put the machine out side and did the blown out the insulation. Is this caused the vent pipe closed ?

I am eagerly looking how to resolve the problem
thanks in advance