Water leak coming from under my washer wirlpool duet. what would be causing that?

First places that I would check are hose connections and the seals on the water pump...

If the seals are leaking the pump has to be replaced.

bad water valve or vacuum lock in drain line causing water to come back into washer when cycle is finished

Pull off the lower front panel and watch while washing . You should be able to pinpoint it .

empty the washer. then remove the bottom panel of the machine.put some water in it and see if the water is leaking when it is filling or full.I have seen a small hole in the tub just behind the bottom counter balance where the mounting bolt goes you may need to use a small mirror to look under there.

Could be limescale in the pipes under the sink or blockage in the sink.
Disconnect pump from taps - put bucket under pipe and run tap - if water coughs from that pipe, its the sink not the pump.

That happened to mine I had to replace the "brain" of the washer....the part was about $170. I think it is called the control panel.
There is a test you can run...look in the manual.

make sure to look really close all it takes is alittle whole in that seal anywhere to cause a leak try to look close while it is running but first dry everything you can and then run it. also make sure your door glass is clean if it is leaking down the front just alittle dirt or hair can cause a leak aswell

I FOUND THE PROBLEM WAS THE VALVEWHICH CONTROLS THE WATER INTAKE ON THE TOP OF THE WASHER. I PICKED UP THE REPLACE VALVE IT WAS LOCATED AT THE TOP OF THE WASHER WHERE THE WATER INTAKES ARE. THIS SOLVED MY PROBLEM.

yOUR SITE WAS VERY HELPFULL

THANKS ****

remove and clean any obstruction or deposits around the inner door seal use H.E. detergent over sudsing can cause that too.

If the leak started occurring after the bellow was replaced, and it's on the left hand side of the door, I suspect the bellow is not seated around the fill tube all the way. I have experienced this problem before. Check the fill tube where it comes in by the door. The rubber should be seated back far enough to allow the tube to fill into the tub without obstruction. It could be that the fill tube is forcing water BEHIND the bellow and leaking into the washer and on to the floor. To answer your question, "YES", replacing the bellow could have caused your leak.