Till recent versions of reef-pi, there was a bug that we didnt store the year' part of the timestamp in usage data. as a result usage values of same months/days of different years will overlap and cause confusion. This was fixed in last release. I m not sure if this is the same bug, but thats something to be aware of.I've occasionally noticed the ordering of values on the charts sometimes being incorrect. I don't think we have an issue for it yet.