That does sound odd but manufacturers do change things up. I have 72 gal of grey water capacity spread across two 36 gal holding tanks. My galley is dedicated to the aft tank while the bathroom sinks and shower go into the other. No connection between them and they have separate dump valves and connectors. The shower and bathroom sinks fill about four times faster than the galley and I can camp 6 days before the kitchen fills.
2014 Windjammer 3025W Diamond 34.5 ft 8300 lbs.
2010 F150 SC XLT 4x4 5.4L, 3.55 gears 20" rims
12 k Equalizer WDH, Firestone Airbags, HD Bilsteins
TST 507RV TPMS