Could be normal, has it done always done that?
Fair chance you may be hearing water dripping some into the vacuum breaker (AKA anti siphon or air gap) which then flows out to the top of the bowl. Some use chec kvalves but in some cases like your RV toilet it tends to be a air gap type.
Vacuum breaker is basically a place that water shoots across a "air space" and prevents your supply water line from vacuuming water out of the bowl and into your potable water lines.
Depending on position of the water valve in relationship to the air gap, there may be some water line in between which slowly drains once the water valve closes.. That slowly draining water in that short water line may be what you hear as drips..
If you can't find water under or around the toilet it may be normal operation..
