Stacking of lines

Firstly:

This may be a case of overlapping cords.

You can try to set the weight at 5-7kg. Then pull the rope outward until it can't be pulled anymore.

Then slowly pull the rope back to the original point at a constant speed.

If you follow the above steps, you should be able to solve the problem.（ at least try 4-5 times)

 

Secondly:

If there is a noise

Hold the removable pulley block in your hand and pull again

Listen and see if there is any sound.

 

(Enter free training, set non-barbell mode, weight mode standard, weight set to 10kg,pull the left rope out fully, see if the retract is smooth or not)