Not calculating correctly

I was on my phone for at least an hour today and for hours yesterday. I decided to check and today showed 0 minutes and yesterday 58. Both wrong. Due to the battery use, I deleted the app today. If it isnt working on the free version, why would I pay for it? Im disappointed. I read such good things about this. Back to old school pen and paper.

DarthInsidious about Moment - Screen Time Control, v2.5.3