Hey Guys, sorry for the late response here- been KO'd with a nasty cold.
The rain totals differences are due to a rounding error when the software converts the sensor rain data from (mm) to inches internally. This is a bigger issue with lower rain totals as entire "bucket tips" can be missed. Changing the display units will not fix this issue. Our software team is working on the problem and a firmware update will roll out before the months end to fix the issue.
Thanks!!