Thermostat Card Issue

I recently started using the thermostat cards and have had zero issues over the past few days. For some unknown reason, one of my three thermostats suddenly started reporting a target_temp_low attribute, and now I get two sliders on that thermostat card. If I go to the developer tools and set the target_temp_low attribute to null, as it is on the other thermostats, it goes back to a single slider. This works for a period of time, and then the attribute is refreshed, and the problem reappears. Unfortunately, trying to set this attribute to null via a script or automation generates an error complaining that the new value is not a float.

My understanding is that the two sliders should not show up unless the unit is in heat_cool mode. All three of mine are in cool mode. Any ideas on preventing this from happening?

Thanks!

Sounds like a problem with your thermostat rather than the lovelace card.

Might help if you share what thermostat you are using and the config for it.

The thermostats are Insteon devices and come into Home Assistant via my ISY994i integration. The only configuration involved was plugging my ISY credentials into the integration.

Home Assistant: 0.116.4
Thermostats: Venstar T1800 w/INSTEON Thermostat Adapter v.95
ISY994i firmware: Insteon_UD994 v.4.8.0

Thanks!