Welcome to the forum.
The tank indicators are notoriously inaccurate, especially the black tanks. TP and other stuff gets hung on them. The only level indication I look at is Full. I'm not familiar with your model but it seems a bit odd the kitchen sink dumps into the black tank. Trying to figure out why things are done the way they are will drive you bonkers.
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Keith and Lisa Ward
2019 Pinnacle 36FBTS
2021 Ford F350 XLT CC LB DRW 6.7L Diesel
Demco 18K Autoslide Hitch and Timbrens
2019 Ford F350 SB 6.7L Diesel (Gone)
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