When the search tool is used to find TIED pairs, it is important to adjust the master and slave items correctly. A single item can only be used once as a master. So the tool tries to resolve this by finding the optimal distribution of master and slave items. If there is no solution to this distribution, an Unresolved list of items is displayed. A new version of PrePoMax has some additional filters to help in such cases.
Using contacts, this should not matter since a single item can be used multiple times as a master item in a contact pair.