Yes, my inline Hayward does/did the exact same thing. This is the reason my CYA was >100 at the beginning of last year, after only 1/2 year in use, AND following initial opening algae bloom. I can only guess how high the CYA really was.

I didn't waste my time trying to correct valve dial, just took out the pucks for good, quit using it, and now only use bleach. It's my understanding that this problem is very USUAL in this model. I'm not sure of the whole Hayward line, though.

CaryB