I've taken a look at your account and found that the Rachio is operating as expected based on your current schedules. You're currently utilizing two Fixed Days schedules.
Fixed schedules' Rain Skip only relies on the past 24hrs of weather data to determine if it should skip watering.
On Sunday, your Rachio observed 1.32 in of precipitation from the previous 24hrs and determined that it could skip.
In this instance, the rainfall occurred over 24hrs prior and therefore was not considered for a Rain Skip.
You may wish to consider switching to a Flex Schedule. Flex Schedules will water as needed (using user imposed restrictions). Each zone will have it's own "bank account" that will increase with "deposits" (watering events, rainfall, etc) and decrease with "withdrawals" (evaporation, wind, etc). A minimum and maximum budget for each zone will be set and the water level will automatically be kept within this budget given watering rules you set. Think of it as automated watering times with real time, seasonal adjustments on a daily basis.
In short, a Flex Schedule is a smarter way to utilize longterm historical and real-time reported weather data to determine whether your lawn needs watering.