The main problem is the level sensors, they are NEVER accurate. All of mine have read 1/3 or 2/3 regardless of how much is in them, I don't even look at them anymore as they tell me nothing.
Do you have a clear fitting when draining so you can tell when it's actually empty?
Danny & Linda
Former '13 FB owner
I would bet that your waste pipe is not properly seated on the tank. It is a friction fit with plumbers caulk around the edge of the pipe where it fits over the waste tank. If it is not positioned correctly you will get waste water dripping and collecting in the pan. I would not cut it, just remove the screws and stay out of the way!
Dean & Cindy (Go DAWGS)
2013 Ram 3500 CC DRW 4.10 "Plain Jane"
(RIP "Struck by Lightning")
B&W 3600 Hitch 25K/6.25k
2012 36RL, Disc Brakes, G614's, 7K axles, Combo WD, Awning Toppers
Full Time Since April 1 2015:)!
At least it is a simple fix. Double check to make sure the black tank is up on the cross members. While you have it open I would run some strapping between the two supports to keep them tight where the tank sits. I had my cross members spread enough for the tank to drop
2015 36RL pushing a 2015 Denali
2015 F350 DRW, 2015 Sequoia SQ38HRL, G614's, Titan Disk Brakes, Trail-Air Flex Air pin box, SRE4000 w/ X-brace, Heavy Duty Shackle Straps w/ Wet Bolts & New Springs.. Now I am done for awhile.