Yes, on mines the fan always turns on. Maybe not at startup, but after 10-15mn, there is always one that start. If I put it to heavy work, then second starts, and there is noisy...

I've tried changing the thermal paste, it delayed the time before the fan starts after boot. So guess it did some good. one fan running often on these is normal. Second fan, less so.

Maybe check if there is no dust blocking the air entries to the fans.