Hi,
A snake can move loose bedding around at any time really - and older mats can also develop "hot spots"
I'd triple check the temps under the substrate and at several places on the mat.
Also if a cold snake lies on the thermostat probe it will raise the heat - this and peeing on it are the main reasons why it is better to have the thermostat probe outside the enclosure.
Also make sure the humidity is not high enough that the bedding has become wet in places - this can also cause a pink belly before it turns into scale rot.
dr del
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