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HVAC changing temperature

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It was cool here on the weekend. The HVAC in the car was set on Auto with a temperature setting of 21.5° C (70° F)
When I got in the car after a stop the temperature jumped up to 25.5° C (78° F)
This happened 3 times on the same morning. Outdoor temps were at around 11° ~ 14° C (52° ~ 58° F)

Any reason for the automatic change of set temperature? I understand the change from Cooling to Heating as that is normal. But the set "temperature" should not move.
 
I have noticed some somewhat random changes in my set temperature as well recently. I'm not sure what's going on. I'm just chalking it up to a software glitch. I set it back to the normal settings and moved on.

I changed it back as well, but being a new user I was looking to see if this was a "hidden" feature, just like I was told by a Service Center that getting water in the front Frunk was 100% normal!! ( A different s/c checked it out and has to order the basin assembly, there is an issue with the gasket....Not a "hidden" feature as the first S/C told me)