Propane fridge has a burner and is moving heat from inside the fridge to the coils on the back to be vented to the outside. Refrigerators don't make cold they move heat.
In this case to a space behind the fridge and probably right under your stove. Heat rises, stove gets warm.
There should be some sort of vent panel in the outside wall behind the fridge so the heat can escape
but the temperature in that space can get pretty warm. Suggest getting one of those inexpensive fridge thermometers so you can figure out what the number settings on the dial mean in terms of food storage temp.
Some people end up using a 12 volt computer fan with a switch mounted to blow air through the outside vent to help remove the heat, cooler it is behind the fridge the better they work.
The fridge also works better if it has more stuff in it, especially if pre-chilled before loading, does take a fair amount of time to get cold. One other thing if it gets really hot outside (or in the space behind the fridge) the inside temp will not stay as cool. So you might be able to keep ice cream in freezer at 70 degrees but not at 95 degrees of outside temp.