It isn't supposed to do that after it starts. Maybe something wrong with the Kwackers adjuster or you're using the wrong oil in it.
I thought about oil and tried different oils. No change. My theory is this: the Kwacker OEM CCT has way too much slop in the ratchet mechanism. Brian had a great post on this with pictures awhile ago. Each notch is at least 1/16" or more and the spring is in a slot that is almost 1/8" wide. Meaning there is almost 1/4" slop between ratchet or no ratchet. If you happen to have a bike that the cam chain is just the right length that under oil pressure the CCT almost but doesn't quite latch, then when oil pressure goes down it backs off almost 1/4". Bad design IMO. The teeth could be closer together and the slot could be thinner with almost no change in cost.