When setting the Maximum difference value, it appears there’s a conversion that’s happening.
If I set it to 18 and press ‘Send to Photon’, then ‘Update from Photon’, the value is 32.4.
If I set it to 10 and press ‘Send to Photon’, then ‘Update from Photon’, the value is 18.
Thanks for reporting and the great animation to show the problem.
It was a bug. The value was interpreted as a regular value, instead of a temperature difference (which takes into account Fahrenheit/Celsius conversion). That is why if you sent 10, it was interpreted as 10C, instead of 10F. A temperature difference of 10C is 18F.