Running the models and looking at the OpenStudio Results, I noticed some suspicious things:

• The heating and cooling design load is zero.

• This is because there is no heating and cooling setpoint schedule assigned to the ThermalZone in the model

Once you add thermostat setpoint schedules to both models you'll get results that make sense. Picture below shows where these schedules get added on the Thermal Zones tab.

With more complex system types missing thermostats usually result in failing simulations, but with very simple system types like this single-zone furnace, sometimes the simulation will succeed but you'll see nonsensical results.