Corrupted Roles in database

Hi,

I created several custom roles for a site, for use with the member plugin, and all worked well for a couple of years.

But now 3 of them have been corrupted.

I have created 3 more roles, and moved the users across, so the site is fine.

But I have these 3 roles listed, which I can’t edit or delete (as WordPress gives the error “The requested role to edit does not exist.” when I try to edit them, and just goes back to the role list without an error when I try to delete them).

Anyone know how I can delete them from the list of the roles, as it’s confusing the admin users of the site when they are adding new users and assigning roles.

(Core and plugins are all up to date.)

Thanks,
Jake.