- Report the issue as a bug to Facebook.
- Ask them to delete the two posts.
- If that doesn't work, read this page on Facebook's position.
- File a lawsuit. This could possibly expose what you posted before you make it to court.
This is most likely because one of the other admins removed you as an admin. The best thing you can do is reach out to the other admins and ask them to add you back.
Note that there are different kinds of Page admins. Managers can add and remove admins, so be sure you choose your Page managers carefully.
- File a lawsuit. This could possibly expose what you posted before you make it to court.