User Information List doesn't match Userinfo Table

Question

we are on sharepoint 2010. When I query the Userinfo table in the content database, there is one user that has tp_deleted = 0 and tp_IsActive = 1 but this user does not show up in the User Information List either via http://sitecolleaction/_catalogs/users/simple.aspx or with get-spuser.

I found that this user has a tp_ID that matches another user.

My first question would be how can two different users have the same tp_ID when that Id is used for group membership relations? we have multiple instances where two users share an ID.

second, is it possible to remove this row in anyway besides SQL?

Answer 1

Each site collection has its own collection of users.

My guess is this is happening because the user belongs to multiple site collections and just happens to have the same ID.

Check to make sure that there are no other site collections in the same content database that have users with the same ID.