I am trying to generate some calculated items from an external check item. For at least the "avg" and "max" functions, I know for certain that using a time offset returns obviously wrong data as compared to what is shown on a graph over the same time period.

The external check item from which the others are being calculated, is polled every 5 minutes. Detailed data is stored for 1 day, and history is stored for 365 days.

The calculated items are looking for min, max, and avg over (7d,1d) and (1d,1h). The returned items with the 1d offset are obviously wrong. When collecting without the offset, the "max" seems to return only the last 1d max, and not the specified period of 7d. The (1d,1h) seems to return correct data.

Please let me know if I need to supply any more info.