for some reason that I don't understand my armature seems to be out of place in object mode,but not in edit mode and I don't know how to fix it. Can someone helps me ? I've attached 2 pictures to show you.
Have you accidentally moved the armature or bones in pose mode? You could try switching to pose mode
⎇ AltR to reset all rotation,
⎇ AltG to reset all translation,
⎇ AltS to reset all scale.