Ted here from Shopify, thanks for reaching out to us!
Are you able to replicate this using a different device or browser? If not, I'd recommend clearing the cache on your browser as shown in this tutorial. If you're able to replicate it, can you share the domain with me here so I take a closer look?
Thanks for sharing the URL! That's quite odd, I nor the team are able to replicate what you're experiencing. For example, when I click pistol-blair-boutique.myshopify.com, I'm brought to the password/landing page. So, this is what I see when using Google Chrome and this is what I can see when using Safari on a Mac.
I believe something is stuck with the Safari browser you are using. Would you be able to try Google Chrome or Firefox using a different internet connection (such as a hotspot with your phone provider) or your mobile instead and let me know how this goes? You might need to update your Safari too.
If the error still persists, could you share a screenshot of the page you keep being referred to with me? I'm happy to take another look into this with you.