/3/ - 3DCG

>>981872
if you mean the bone length that doesn't mean anything.

FBX doesn't keep the length of the bones, so blender just guesses the size you can click the armature, go to edit mode hit A to select all then S to scale, then G to move it, then go back to object mode Ctrl + A Apply All Transforms.

You really need to work on communicating your issues.

as when you say the bones are moving that could be anything.