Yep it is drying out ,good thing it is only fresh water because both times the chute was closed and not stuck open so the black tank did not fill up and over and the weather is Warm here in Napa,Ca so that helps the drying process along
it is weird my buddy told me he was having problems with his Aqua flush pedal as well and BAM it does the same thing as mine, His SOB said they would send him a new Thetford toilet for it but he said like me NO THANKS and bought the Dometic 310, $170 bucks for piece of mind is worth it