Hi Eren,
Thank you for contacting Syncfusion support.
We are unable to reproduce the reported behavior at our end. On further analyzing the reported case we could suspect that TextChanged event might be triggered twice in your sample. Could you please ensure whether the TextChanged event triggered only once? If yes, could you please check with below sample and let us know whether the reported issue is reproduced.
If you still face the reported behavior, please provide more information about this reported behavior. Also share us the Essential studio version you are using currently, it will be helpful for us to analyze and provide the solution at the earliest.
Regards,
Senthil