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Sort in dhtmlxGrid

Hi team
There are some records like this in my grid.
Initial sort is as follows

ColumnA ColumnB
TEST3
中村
東京
TEST Group

when I click ColumnB twice the sort is as follows

ColumnA ColumnB
TEST3
東京
中村
TEST Group

If I click ColumnB several times (Even) , The results are inconsistent with the original.

Thanks.

By default grid uses native sorting functionality of javascript. While fast it doesn't preserve initial order of rows. 
You can enable desired mode by using 

           grid.enableStableSorting(true);