Keg regulator jumping

Seems everytime I set my regulator at 10 psi I come back later to see it creeps up to 20-30. My tank feels pretty light. Is a tank almost empty causing this? I used it for 8 to be 10 kegs. Plus purging and carbonating. It’s a 10 lb

Didn’t happen until now?

Nope, has been going on for about a month but I haven’t drank thru my kegs lately. Been drinking my bottle stash. My regulator for the high side says like 800 which is normal but the co2 bottle feels empty

Mine has exhibited similar behavior when it’s getting low. Don’t ask me to explain the science behind it… no clue…