I think you might have this Early On feature turned on. From your nest app, click your thermostat, then at the top right upper corner select gear icon, then look for Early On then double check if it's turned on or off. If it's on, turn it off. Kindly refer to this link here: https://support.google.com/googlenest/answer/9246532?hl=en#zippy=%2Chow-to-change-early-on-settings
Thanks for the helpful reply eveluna.
I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.