Ok @red-izak I had a quick look. In edit mode you have some bones hidden. Press ALT + H to unhide them. The position of the bones is different in edit mode because of the action constraint, the influence is all the way up at 1. Lower to 0 and they will be back at there original position. If you are following the tutorial step by step check the setting in the tutorial compared to yours if you are using a different version of Blender as the default setting may have changed.
I hope this solves your problem.
