AquaRite - T-Cell setting keeps changing on it's own

I've got a weird problem where my AquaRite system will change the T-cell setting to T-3 automatically after I change it to T-15.

T-15 is the correct setting, I'll change it to T-15, then a few hours later I notice the setting has changed back to T-3. I'm guessing it's affecting proper chlorine production.

Anyone had this issue before, or any ideas on the issue?
 
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