Hi @afranklyn! Welcome to netlify community.
It sounds to me like there might be an issue with the way you’ve set up DNS for your custom domain.
You have two options for DNS.
If you want to use Netlify’s DNS, you’ll want to follow these instructions: [Support Guide] How can I manage my DNS with Netlify if I used another vendor to purchase my domain?
If you want to keep DNS at your domain registrar, then these are the correct instructions: [Support Guide] Can I host my site on Netlify but keep my DNS at my domain registrar?
Let us know if this helps!