Which probe? The thermometer probe is inside the tub under the newspaper. It's actually taped down with scotch tape. It's not very sticky so I'm not worried about it getting on her. The other tub is the same.

The temps:


Where she lies:


The probe:


The thermostat probe & flexwatt:


I guess she could be pushing the plastic that the probe is on down onto the flexwatt, but I don't think it would just slowly rise like it is. The Flexwatt actually seems to fluctuate quite a bit. Stupid cheap thermostat.