I am trying to modify the filtered grid example but am having issues with filter

I am trying to modify the filtered grid example but am having issues with filtering part. My data shows and am able to paginate. But when I select a filter from the Dropdown, it briefly lists the selection and then goes back to default. The data listed does not change either.
Let me know what I am doing wrong.
Thanks.

FilterPagingGridExample

OriginalPostID-144521

OriginalPostID-144521

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