Looks like there's an oddity/bug with the image for shared character sheets. It's as if there's an image over an image -- specifically, look at the text of the character name.

https://i.imgur.com/7ZAErSL.png

Isn't that just the default picture, when you don't choose an image?

Background + shadowy silhouette

They don’t mean the character portrait. There is a ghost image of a different character sheet underneath the actual character sheet.

https://www.dndbeyond.com/forums/d-d-beyond-general/bugs-support/76820-broken-shared-character-sheet-previews#c5

I'm glad someone else caught it. I searched before reporting the bug, but didn't find anything.

Ah, I didn't notice it on the first picture, but on the one you linked it's more obvious.