I am running Find Identical on the product of a Union of a large buffer feature class, and some features with identical geometry are given different "FEAT_SEQ" values. These values are supposed to be identical for features with identical geometry. For a couple of spots, this is not the case. An example is an area with three overlapping identical features, and two of them have the same "FEAT_SEQ" while the other has a different one. When I select just those overlapping identical features and rerun the Find Identical tool, it returns a table with all identical "FEAT_SEQ" values. What is going on? The feature with the different "FEAT_SEQ" does not share that ID with any other feature.