First, check your battery!
From the mistking´s homepage
"When that battery is drained, there isn't enough current to trip the relay - your misting system can stay on 'forever' until you manually turn it off."
I never trust batteries that come´s with equipment.....
Second look through the programming. I do not have mistking´s timer but similar. I found that mine had several program 1,2,3,4.... and I had by mistake forgot to set an endpoint to one (or accidental set an on time). This resulted in what you describe....
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