I have Windows 11 Home 25H2 (26200.8039) and every time I restart my PC it keeps switching to light mode.
I found this Reddit post that says that it’s because of Power Toys.
So I disabled it and it still keeps switching to light mode.
I tried uninstalling Power Toys completely with Revo Uninstaller and it still keeps switching to light mode when I restart my pc.
I’ve had Power Toys installed for a while and only started experiencing this problem until a few weeks ago.