Ok Rain water and RO water are bad for the frog. Rain water can have pollutants and is the same as RO water until it comes into contact with the ground. Both RO and Rain water cantain no mineral or salt content and will actually leach nutrients, electrolytes, vitamins, and salts from the frog. Use either tap water treated with a de-chlorinating agent/water conditioner or natural spring water. RO is fine for misting as is distilled water, but rain water is a big NO.

Do you have a Hygrometer(humidity gauge)? Misting heavily doesn't tell you what level the humidity is at in the enclosure although for a period of time it will be high. You can cover 3/4 of the screen top with plastic wrap to hold heat and humidity in.

Compost can be bad if it contains any fertilizers or chemicals. You need Eco Earth Coconut Fiber substrate. I would get some ASAP and switch out the compost. Plus if you used the rain water or RO water to moisten the substrate it will need to be replaced.

Definitely need to see pics of the enclosure.