TO recreate: Have at least two branches in the site where the code of one branch appears within the code of another (BOOK and BOOKMOBILE work, or MAIN and a branchcode of AI or IN). Have at least a patron of each category to see results easily. Run a patron search for all patrons of BOOK branch. See that results include both patrons of BOOK and BOOKMOBILE. It appears that the branchcode is being searched as a 'contains' search, perhaps, instead of exact match on branchcode.