Need help with stack stuck in UPDATE_ROLLBACK_COMPLETE_CLEANUP_IN_PROGRESS

I have a stack arn:aws:cloudformation:us-east-1:384426254369:stack/BraunStack/ac1302e0-6cde-11ed-8837-0a5c7a83545f that I am trying to delete but it's stuck in state UPDATE_ROLLBACK_COMPLETE_CLEANUP_IN_PROGRESS. I traced through the stack events and found out that the problem is this:

Certificate arn:aws:acm:us-east-1:384426254369:certificate/e015608b-e8a9-4dbc-bd7a-d4b299e1c0ef in account 384426254369 is in use. (Service: AWSCertificateManager; Status Code: 400; Error Code: ResourceInUseException; Request ID: ba2370ae-8f61-46a4-a251-aea442d34311; Proxy: null)

so I went to try to manually delete that ACM certificate and it says I can't because it's in use. The problem is, it says it's in use by this:

arn:aws:cloudfront::745623467555:distribution/ENHGSRI0SJ739

The issue is that's not something I see as one of my cloudfromt distributions. In fact, that's not even my account number. It's almost as if somebody else is using my certificate, which is impossible. I do have two separate organizations (with one account each) that I manage, but that's not the account number of either.

So it looks like CloudFormation can't delete the stack because it can't delete the certificate, and I can't manually delete the certificate because some distribution that I cannot find (possibly in another account) is using it:

Failed to delete certificates
Certificate arn:aws:acm:us-east-1:384426254369:certificate/e015608b-e8a9-4dbc-bd7a-d4b299e1c0ef in account 384426254369 is in use. (Service: AWSCertificateManager; Status Code: 400; Error Code: ResourceInUseException; Request ID: 38c32079-f59e-45b8-b753-07b0ee58a4ae; Proxy: null)

Can somebody at amazon tell me how to clean this up? I think step 1 is delete that certificate, but it won't let me. I can always regenerate the certificate and this site isn't in production yet.

Update: I signed up for paid Developer support so I could ask for help. Case 11538935921. It really looks like somehow some other account is using my certificate, I'm mystified how that could be.