Hello Ali,
Thank you for your message.
If you are in Full Control mode, then this behavior is normal. The admin's cursor always takes precedence over the remote cursor. So if the admin's mouse moves even slightly the cursor will return to the current position of the admin cursor regardless of where the remote cursors moves.
However, if you want to let the remote user work without such interruptions you can switch to the View Only mode right on the toolbar:

You can also use Alt + F12 key combination to quickly toggle between Full Control and View Only mode.
Hope that helps.