Thank you for sharing this information.
All of Charlie Duke's NGC labels are individually hand-signed. The NGC label even says "Authentic Hand-Signed" below each signature. Every signature on an NGC Authentic Hand-Signed label is guaranteed to be genuine, backed by our comprehensive NGC Guarantee.
I talked to a couple of people on the eBay Trust team today and let them know about this situation. They have advised that they will look into it further.
In the future, if you encounter a situation like this, please contact NGC Customer Service as soon as possible since we may be able to help fix the issue.