You first need to find out from the change request what the intention was, and then how it got into the wrong roles.
I faintly suspect that you are using composite roles and "doctored" the wrong single or that single was "poached" by wrong composites.
When I see things like this happening I always check to see whether there is a concept (design) error and whether this noticed error is just the tip of the iceberg.
From experience, it is 9 times out of 10 more efficient to redesign than to try to fix a mess of composite problems.
My 2 cents (you need to provide more information!),
Julius