How do i scale the base and bust to fit?

Hello everyone,

I m new to 3d Printing. And my first prints are all from Eastman.

So i printed Scorpion and Doctor Doom and it seems like the base doesnt fit. Looks like the bust is bent more then it should be. I am using the bambu slicer.

I didnt rescale, didnt touch anything. Just opened the files on bambulab program and printed. How do i scale them to fit? How do i check if the base fits the bust?

Any tips? Youtube videos that you can recommend?

Thanks in advance!