There are different settings that the humidifier can be set to. With a heated-hose capable humidifier, there is the heated hose setting. If that humidification option is disabled, the System One humidification is enabled. Both of these sense the ambient humidity level and attempt to adjust the heater to provide a constant level of humidity. This means that, when the system detects a high ambient humidity, it might not even activate the heater at all.
If the System One humidification setting is disabled, you are left with the Classic humidification setting. This is simply a direct control over the heater plate temperature, regardless of ambient conditions.
What you might want to try as an experiment is to go to the Classic humidification mode and see if that works better for you.