Thermostat controls backwards on some dashboards, not on others?

When I went to adjust the temperature from my home office this morning, I found that when I clicked the down arrow on the thermostat widget the set temperature went up by 1°C instead of down; likewise the up arrow lowered the set temperature. But when I use the controls on my bedroom dashboard, the down arrow lowers the set temperature and the up arrow raises it by 0.5°C as expected. I checked a couple of other dashboards and found it behaving backwards on a third dashboard and normally on the fourth. All dashboards are configured for the same thermostat device and use the same widget. Any ideas why they are behaving differently?