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Hi Rsleve,
Thanks for your updates, this might be caused by the Microsoft changes on the legacy audit log in SharePoint Online.
Start from July 9th, the SharePoint Online Legacy audit log will be migrated to the Unified audit log in Office 365 Security & Compliance Center step by step. Per your current issue, I think this change has been already deployed in your tenant.
In this kind of situation, please inform your organization's Office 365 administrator of this, and ask him to create a support ticket in the Office 365 admin center. The support agent there shall confirm with you if this issue is related with this change.
Regards,
Alex Chen