I have a pool that is about 1 week old. Everything seems to be going well but I think my chlorine level is a little high. I’m at just over 3PPM. The IC40 is set at 60%. I want to reduce to 40% but every time I hold the minus button, it flashes and goes to 40%. About 15 seconds later is flips back to 60%. What am I doing wrong? It does seem to like any setting aside from 60%