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I don't know if this is intended to work this way for some reason but if someone uses FilterByColumnAsync on a column with a value for example "test" then if on the same column calls again the FilterByColumnAsync and use a string array e.g ["test","test1" ] this results in 3 WhereFilters generated with values "test","test","test1" because the state from the previous call is saved. In my opinion this shouldn't happen and every time there is a new call to FilterByColumnAsync any previous state is cleared unless this is an essential mechanism for DataGrid. I think this state is saved at DataGrid.FilterSettings.Columns.