Hi @Dclumes, I am another recently started Rachio user using Flex Daily. Did the rain happen before you setup the Rachio and associated it with a weather station? If it did, then I went through basically the same thing. We had a ton of rain a day or two before I setup my Rachio, and the system does not look at historical precipitation data upon first setup. The system seems to start with "assume empty" and will fill your zone to 100% moisture levels upon first watering.
If you open the application and tap on a zone you should see a moisture level %. What is it reporting for percentage? Tapping that brings up a chart and tapping 'more detail' in the chart view will expose any data the system is using to make decision on when to water.
It's a little weird and I don't like the "assume empty", but it's what we have and seems to err on the very cautious side. In the moisture chart you can click Adjust and then 'fill' a zone if you know it's still very saturated from your recent rain.
I'm sure others will chime in and hopefully correct anything I may have misrepresented. I'm still learning this system as well.