Rain rate vs rain interval?

Does anyone have any idea why Wunderground is reporting my rain data as the difference between each 5-minute upload as opposed to an hourly rate?

originaly wunderground (and I am ther first person to have data appear on wunderground) it was set for only every 1 hour data updates…
but then people wanted faster updates
so wd now sends your rain total for the day to WU
they have struggled with the rain data for a long time now…becuase of the issues associated with fast update intervals and trying to convert to 1 hour basis

That explains it. It actually makes more sense to display total rainfall rather than the rate. We can figure that out. I just wanted to know if it was something I was doing wrong. Thanks again. Paul