My Website is confused about authors

my website thinks that if somebody hasn’t posted yet, then their author id is another author.

we have about 5 artists that havent posted yet, but all of their pages are displaying the info of this one other author.
I would be fine if it was the admin info, but it’s not.

this all changes once an author posts, but until then it’s just displaying the info of this one author
anyway to fix this