I had this happen once a while back, and it occurred as the tank filler nozzle was removed. The tech doing the filling just re-connected the nozzle, then removed it again, and the valve unstuck - no further problem. In my experience, this is not a frequent problem - just occurs occasionally. But yes, for peace of mind, I would take it to an LP dealer or shop, and have it checked.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.