Some questions first to avoid confusion?
When you speak of any lights, are you speaking of the interior lights, not headlights, etc for the auto part of the RV?
Are these switches on a six button panel just under the touch screen?
The one in yellow here?
Do these involve/ show on the touch screen in any way?
What I'm leaning toward is that this is a strange one for the normal wiring and switches but might have more electronics involved if working with the touch screen, so just trying to cut the chase if possible!
If not involving the touch screen, I might start with pulling this panel out and looking for any stray wires making a short circuit from on set of wires to another.
Kind of odd situation but then those strange things happen? Perhaps as simple as some form of attachment biting into insulation or wire rubbing against metal some way?
a good guess is all I've got. 
Linear Mode
