It is not unknown for GTP to spend time on the floor occassionally.
I have my set uo so that the ideal temperature is where the snake spends most of its time perching, threfore the floor is slightly cooler (further from the heat lamp) and the other perches are at varying temps around the ideal.
How are you cycling your humidity? Having constant high humidity is as bad as constant low, i have mine at 80% in the morning drying to 50% by evening when i respray to 80% and it will dry to 50% by morning.
Post pics and details of all your setup and we can helpp you make sure that there is nothing that needs adjusting, it may just be your snake likes being on the floor
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