Most likely culprit is the dryer vent. Check to make sure it hasn't come loose or that it isn't full of lint at the bottom. If so, it could be releasing a lot of moisture. If still attached, just loosen the hose clamp where the dryer vent is attached and clean out any lint. If you have an actual leak or stray water then You should be able to see it where the washer drain hose pokes into your trap. Maybe it came loose and is spraying water.
All just guesses b/c I can't see it from here. Good Luck, hope this helped.