Have had this thing installed for over a year on a combo gas furnace with AC. It is now set for heating mode since the weather is cooler. It is the model with the blue levelling tube.

It has learned our normal turn up (20C) and set back temperatures (14C) and times pretty well. The trouble is when we are away and set the temp down to 14C, it keeps on turning it up and down according to the shedule. It shows on the app that it knows we are away, so why does it keep turning the heat up?
Is there some setting to change?

Thanks, rstew