Chains must not have too much slack in them. There should be about 1/2" (12mm) of vertical movement on the slack side.
It could be your have a worn out chain.. Look at the drive pinion. The teeth should have a flat top and both faces of the teeth should have the same profile. If the sprocket is very worn, the teeth become pointed and the chain does not sit correctly on the drive chain wheel on the rear wheel, (i.e. there is a gap between the chain and the inside edge of the driven sprocket.
If you change your sprockets, change the chain also (you must do this as the chain will also be very worn).
If the chain is tensioned properly then you may have a burr or burrs on the driver links. It makes the driver link to fat to fit in the groove of the bar.If you can fin the bad link or links grind off the burr. If they all have burrs it is easier to get a new chain.
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