Hi Krishna,
As we already mentioned in this
thread, Empty option in Filterbar causes unexpected behavior. So we already logged a bug regarding this issue. We have requested our developer to provide more information regarding the timeframe to fix this issue. Hope we can provide you with more information within a 3 days.
Kindly let us know if you have any other queries.
Thanks for using Syncfusion products.
Regards,
Gokulkumar.B