I made the substrate more wet to increase ground humidity.

It is normal that it burrows sometimes. It is winter and frogs can feel the seasons changing outside, even if the care conditions don't change in the terrarium.

My temps go from 75,2°F (under a wood bark which is a hidding place and the coolest point) until 86°F at hot spot.

In roughly 70% of the ground surface of the tank where the frog can go, there is between 78.8°F and 82.4°F.

but when it is in its water bowl, iyt keeps on jumping and having an extremely high feeding response (Even on earth )