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On the rollup path the all-time count, min, max and mean are composed from DAY buckets plus one raw aggregate of the readings older than the fold window. The bucket half read every DAY bucket the account had, the raw half every reading before now minus five years, so a reading on any day that had a bucket before that instant was counted in both. Such buckets are common: the per-write hook folds whatever day it touches, the Apple Health import folded whole spans until this release clamped it, every fold snaps its start down to a whole day, and nothing removes a bucket once the moving window has passed it. The count came out too high and the mean leaned towards the doubled days, while the live fallback reported the true figures for the same account. Both halves now meet at the start of the window's first UTC day: buckets from there on, raw readings before it. A reading lands in exactly one half whichever buckets exist, so buckets already written before the window need no repair.