Minute data — aggregation/rounding

I am trying to reconcile my minute level data with the aggregated half-hourly, hourly, and daily data. However, there seems to be some discrepancy.

The half-hourly, hourly, and daily data reported by the API, Bright App, and my energy supplier (Octopus) are consistent (subject to rounding).

However, if I take the minute level data returned by the API and sum it, then there is a discrepancy between the summed data and the half-hourly, hourly, and daily data.

Do the aggregation functions apply some form on intermediate rounding, or is there some other explanation? I also note that the minute level data is reported to an inconsistent number of significant figures.

Any help would be much appreciated.

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