@Tracy Johnson Welcome to Microsoft Q&A, thank you for posting your here!!
Please check if you have enabled blob soft delete feature on the Storage account from Azure Portal under data protection as from the Metrics from Azure Portal it won't include the blob soft deleted capacity only active blobs capacity is shown.
Please try to calculate the size of a Blob storage container – via Storage explorer
- Sign-in to azure storage explorer using any of the approach mentioned here - https://docs.microsoft.com/en-us/azure/vs-azure-tools-storage-manage-with-storage-explorer?tabs=wind...
- Select the storage of your interest.
- Select the container.
- Click “Folder Statistics” button.

The output would be shown as below and it would display both Active blobs, deleted blobs
Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.
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