Month rain total is way off, how to fix?

The April 2018 rain total says 23.02 inch when the daily rain adds up to 13.62 in.
What could have happened and how do I fix it?

I tried a couple of settings to correct rain month totals but they dont do any change when I click the button

10.37S69

Thanks

you can set the current month rain total
via control panel
offsets and initial rain

Thank you, I fixed it with your help :smiley: