Hello and welcome to the forum!
It may be the water produced during the air conditioning process is collecting in the unit itself, and not getting out. Then, when you hook up, the angle of the RV could allow the water to escape.
When the ac is operating, do you see water coming off the roof?
I'm sure someone smarter than me will be along to help.
Stay safe!
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Gary & Deb (44 years)
RV: Keystone 2013 Alpine 3495FL
TV: 2014 RAM 3500HD Laramie Long Box, 6.4 HEMI, 4x4, 4.10's, with Mopar Puck system, and a B&W Companion hitch.
Retired Firefighter/EMT.
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