The reservoir is located in the front near the batteries. It sound like you may have a valve that is by-passing fluid. Once you have determined that your fluid level is OK, I would then recycle the front landing jacks two to three times. And I would then cycle the level-up system a few times. Hopefully that will take care of the issue.
Bob and Debbie (both retired) with Senior FurBabies Grizz (a German Shepherd mix) and Bailey (a Lab mix)...and sometimes a Grandkiddo or 2! Full Time RVers since July 2013 Redwood: 2012 36FL with sliding patio doors
Tow Vehicle: 2011 Chevy Silverado 3500 HD with 6.6 DuraMax Dually