Github signup not using primary email address

I have two email addresses registered on my GitHub account.

1. The original address I used to create the account
2. A newer address I registered later and which took over the role as Primary Email address associated with the GitHub account.

When I signed up using GitHub, kagifeedback.org fetched the original/oldest address instead of the one marked as primary.

I expect that kagifeedback.org uses the primary email address associated with the GitHub account.