Blob Storage Capacity Metrics are Wrong

Question

The [Blob Capacity] metrics on my storage account are simply wrong. I've had the account for ~10 days at the time of this post.

I'm viewing the capacity used in several different ways, all report the same value, all are wrong:

Examples:

• the INSIGHTS page in Monitor: Reports 87.56 Gb under Capacity. This number hasn't changed in 2 days and I can easily total over 2TBs just by manually adding up the contents of one folder, it should be about 2.8 TBs (for the last day or so).
• I've run this POWERSHELL command; it reports the same. ((Get-AzMetric -MetricName "UsedCapacity" -ResourceID $ResID to storage account)).data. It reports the same number as INSIGHTS. Wrong.
• the STORAGE BROWSER page in the left-nav for the storage account reports: 4 containers. There are only 2. There has never been 4. It reports 1.02K files. That's off by more than 900 files.

I've let this account sit for several days and the numbers are still wrong. Worse, Microsoft is reporting them by the :30 past the hour as if it's a 'fact'. This would flunk an audit. It's materially false.

What's wrong?