MacBook Pro 2019 (intel) uses power when turned off

Hey guys, After I bought a M2 Mac about 4 months ago I really haven’t used my Macbook Pro, but I decided that it can be used for travels/vacation. Before my vacation I updated it (fresh install with the newest update), charged it and used the turn off option. To my surprise, it was at 58% after my flights. That was weird, I thought. But maybe it had something to do with it being moved through security, into the plane, different air pressures etc. But it happened again when I traveled to a new hotel by car. I used the turn off option and closed the lid when it was dark. I didn’t use the Mac the first day at the new place, but when I turned it on now, it had 49% battery. The charge was around 90-95 when I shut it off 1 1/2 days ago. Why is this happening? I have a bootcamp/windows partition- can this be the issue? Battery health shows as normal. I will try to use sleep mode the next time I move to see if that also use battery this fast. Thank you for your assistance!