A few years ago I had what I think was the same problem but cannot find anything I said on here 'bout the the solution was.
I think I've sussed it, but let me tell you what I've found and see if that triggers thoughts in your minds.
I went into the utility room and found the floor wet. So I went outside and found that water was coming out of the building around the drain pipe rather than through it. I ran a wire up in there until I hit the first 90 and couldn't get it to go farther, but that didn't do anything.
Then I started checking and realized that I'd left the lid to a small tote/bin under the air compressor and the connection between it and the drain. Seemed odd that I would leave something like that under there, but when I started to pull it out I found that it was full of water. So it appears to me that one or more of those connections there is leaking and the lid is overflowing onto the floor.
Here's what I'm talking about, but I've run out of time to work on it today. So do any of you remember?
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI