Today, while reviewing the US, Virginia—Birth Records, 1853–1896 [MQ7Z-84D], I found a page of Marriage Records and not Birth Records.
The notification link wasn't working in the Indexing site.
Just mark the batch as Non Extractable Data. That's what we do with images that don't match the project type. When we mark batches as NED, Family Search looks at them to be sure they indeed shouldn't be indexed. And since Family Search is aware of this problem, they'll take care of it. They'll save the marriage batches for a VA marriage project.
There have been multiple threads on this subject over the last several days. I read that the indexing team is working to resolve the issue.
As a note, other documents in the batch with this error were: