We're using Civi 4.5.4 and Drupal 7, and finding that the deduping rule is confusing us - or we have a bug.
- Unexpected duplication of addresses. Contact A (the duplicate) has a home phone, email or postal address Contact B has the same of any of these. We choose not to include these in the duplication merge - we don't check its merge checkbox.
We expect that Contact A's home detail will not be moved over to Contact B. Instead, after the merge we find that Contact B now has an additional home address containing the same email, phone and/or postal address as Contact A. In other words, the merge process is duplicating the home address.
If we do check the merge checkbox, then the merge process over-writes or adds as expected.
(We did explore using the demo site, but it was in Russian, and we weren't sure if it was wise or kind to set it to English for our purposes, nor how to do this.)