Ask HN: I have a not secure ssl certificate on my netlify hosted static page

I hosted my static site on Netlify, and was given an SSL certificate after adding a custom domain name by changing its DNS servers, and it has been working fine but today after doing a prelaunch on product hunt(https://www.producthunt.com/posts/repetil) my site is showing a not secure tool bar notification in chrome due to my certificate being invalid because it was issued to netlify, and I am left wondering if I am the only one with this issue.