I don't think that humidity has to be that high.

What's the temperature? All you wrote was "yes"

Is declorinator used? If not then the water is going to be very toxic to the frogs.

All the substrate you listed except the tropical soil is an impaction risk. I would remove that stuff ASAP

Since the crickets are roaming free the impaction risk is much greater as well

You need to use the calcium every other feeding and multivitamins once a week.

The frog may still be getting used to his or her habitat.

I would quarantine ALL of the frogs anyway. If they end up having a disease then you will have to gut and disinfect the whole tank before adding ANYTHING else. Also, to monitor poop.

Is there a size difference between the frogs???

Sounds like the frog is stressed due to something in its environment. Whether it's another frog or chemicals I do not know