As noted above, your issue is most likely the Intellitec latching water controller. All of your switches are momentary switches. When you push one, it connects to ground (-) and turns on the controller. The controller then sends ground (-) to the pump. When using a latching controller, you can add 100 switches, it doesn't care.
Are all of the switches exhibiting the same issue? If so, the controller is most likely the culprit. If it's just one switch, it's probably the switch.
On a Monaco, the controller will be mounted in the wet bay on a wall. Find the black ground wire on the water pump and follow it to the controller, usually within a foot or so of the pump. The controller looks like the photo below. They're available on Amazon for $42.00, linked below.
https://www.amazon.com/Intellitec-00...s%2C136&sr=8-5