I assume “HE” is Hubitat Elevation.
That means whatever software you are using on HE, to expose devices to Home Assistant via MQTT Discovery, is responsible for rounding the values (via how it defined the sensor’s configuration).
FWIW, I have numerous devices modeled as MQTT Sensors and their values are received, via MQTT Discovery, unadulterated by rounding or anything else (they aren’t coming from Hubitat).
See that first topic in your screenshot, the one that starts with the word homeassistant? Post its payload. That payload contains the sensor’s configuration.