CLA Already Signed but PR Still Asks for Signature

Cause

The email configured in your local git config when committing does not match the email on your GitHub account, so the signature is not recognized. Check with:

git config user.email

Fix

For how to configure git, see is-it-possible-to-have-different-git-configuration-for-different-projects

After setting the correct email, recommit existing commits with the new configuration for the change to take effect.