If a profile on here looks blank, it might not actually be blank!
You can check if a profile is blank by clicking on ⋯ and then "Open in browser" or "Open original page". These will take you to the profile on its own server's website, which is the most up to date version of the profile.
Profiles may appear blank if no one on your server has followed it before. If you follow the account, its posts will start showing up on your server.
More info at https://fedi.tips/why-does-someones-account-page-look-completely-blank-is-it-really-blank