As far as I can see from the provided XAML snippet, the editors that are defined in the columns' CellEditTemplates are not data-bound. You need to specify a data-binding to the target model property, so that the changes that occur during edit can be propagated to the respective data items. In your scenario, these changes are lost after the edit operation gets committed. Here is a documentation article
that illustrates how to use CellTemplates and CellEditTemplates.
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