Hi mindofwinter,
Thanks for posting in Apple Support Communities. Since this happens in Safari, we'd recommend using the guidance from If Safari doesn't open a page or work as expected on your Mac - Apple Support. Below are a couple sections from that article that might help you narrow this down.
Check Safari extensions
If you installed any Safari extensions, turn extensions off. From the menu bar in Safari, choose Safari > Settings (or Preferences). Click Extensions, then deselect each extension to turn it off. Learn more about Safari extensions.
If you find that an extension is causing the issue, make sure that the extension is up to date.
Test with a private window
A website can store cookies, caches, and other data on your Mac, and issues with that data can affect your use of the website. To prevent the website from using that data, view it in a private window: From the menu bar in Safari, choose File > New Private Window, or press Shift-Command-N.
If that works, use the following steps to remove the website's data, including its caches and cookies. The website can then create new data as needed. If it's a website that you sign in to, make sure that you know your sign-in information before continuing.
1. Choose Safari > Settings (or Preferences), then click Privacy.
2. Click Manage Website Data.
3. Select the affected website from the list shown.
4. Click Remove.
5. Click Done.
6. Open the website again in a non-private browser window.
If you need more help, check out the complete article using the link above.
All the best.
