Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
When you want to change/upload NOT YOUR OWN avatar at the profile page as admin then after the Save Changes click the selected pic become your own avatar and the member's remain unchanged.
Fixed in https://github.com/designcreateplay/NodeBB/commit/43e8016dd1d4c5a97f58a70be5c89cec140b5845