Question About Email Enrichment Waterfall and Verification Issues

Hello, loving Clay so far - nice work! Have a question about a possible issue with an email enrichment waterfall I used the template email enrichment waterfall with 5 providers and Neverbounce for verification. It looks like it worked correctly on most rows. However, in some places, one (or more) of the email enrichment providers found an email and it is "valid", but the last, visible "Validated Work Email" column (NB verification I think?) column is still blank. Not sure why it is still blank. I have tried to force-run the column multiple times with no changes. Have plenty of credits. Unsure the logic that might be in play behind the scenes (or how to see behind the scenes for that) attached is a screenshot of an example here is the URL to the table Thanks!