Did you mist your substrate or anything? The T8 holds moisture very well. I use paper towels as substrate and don't ever have to mist to keep it in the ideal range. One tiny puff of mist and it'll come up to the 75% humidity range for the next day.

I would center the water dish, either change out the substrate or dry it out a bit (or use paper towels or something that holds less moisture) and re-evaluate.