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A shapefile Boolean field will not classify correctly in ArcView 3.x after edits are made to it in ArcMap 8.x.
ArcView 3.x writes True (T) and False (F) to Boolean fields, while ArcMap writes Yes (Y) and No (N. Once values are edited in ArcMap, they appear as Y and N in ArcView 3.x, and thus fall outside of the original classification as set up in the legend editor.
In ArcView 3.x, to properly classify values that have been edited in ArcMap, modify your legend to also accommodate the ArcMap Boolean format (Y/N).