It’s probably an issue with the temperature in the app being Fahrenheit instead of Celsius which is the unit used by Matter and the driver.
This is a related discussion:
Apparently SmartThings app internally creates the list of possible temperatures in Celsius by 0.1 ºC steps and then converts the values to Fahrenheit. The temperatures you see in the screenshot, if converted to Celsius, are spaced more or less 0.1 ºC so in Celsius it would look good with round numbers. Or they just used 0.2 ºF steps as an approximation to convert 0.1 ºC steps…