Well. let me try to rephrase it in my own version of English and see if this is what is happening.
You load film in the camera, close the back, and wind the lever forward until it stops. At this point, you wind the lever back until it stops, and the counter says 1.
If you now try to wind the lever forward- without firing the shutter- the lever will go forward, the film feels as if it is winding on. When the lever stops going forward, you wind back until the lever stops. The counter now says 2.
This operation- no firing of the shutter but the lever winding forward and the counter moving to the next number- is possible at any frame number in a roll.
When you have finished the 12th frame and wound the film on and open the back, the film is now in the bottom chamber.
Well, if this describes the problem, then yes, it is a problem. Something is wrong. You paid for a working camera, and you do not have a working camera.