An addition to the previous answers regarding the Bounding Box.
The 2 images below show the same character, in the same scene but with different poses. The first on has a T-pose and the second one an idle pose.


Note that the Bounding Box extends to the outer limits of the character and is independent of the pivot point. If you have a "stray" object in a scene attached to another then the BB will extend to the limits of that object.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.