I am also using two Ecobee thermostats and have thermostat tiles in my temp control dashboard. I am using the community Ecobee Suite Manager app and the device page for one of my thermostats shows this:
Not sure if this is a problem as I have to admit that I rarely utilize the tile to control the thermostat (mainly use it to monitor what is going on with the settings. In the driver code, all attributes seem to be delineated by apostrophes (‘) although standardTile States are delineated by quotation marks (“). Not sure if this is helpful (or if it even matters) but I am curious as for some reason my dashboard tiles do not always accurately reflect changes made at the thermostat.