Filling the freshwater tank via the leaking check valve is very common.
Don't understand your grey tank filling. If you think it's filling just because the level lights say it is, be aware that another common issue is that the level lights for your tanks are notoriously inaccurate and will light up even with the tanks empty. If you have a sewer connection, try draining the grey tank and see if you really get anything out of it (more than what you may have put into it from your city water use, anyway).
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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