Numerous Profile Updates have suddenly appeared in the Blackbaud Sphere Connector, and they all came through with the same date.
A Batch Update is most likely the cause of this. To verify in your Sphere account, go to Contacts > Database Management > Manage Contacts > Import Data. Hover over the Batch name and click View Detail. Here you will be able to see the number of records that were updated.
If this does not appear to be what happened: Chat With Support and reference this article.