Hi Akshatha,
Greetings from Syncfusion support.
We checked your reported problem but unfortunately were unable to reproduce it from our end as the header checkbox was properly checked when all the record checkboxes were selected. You can check the below sample for your reference,
Please share us the following information to validate further on this,
- Are any console errors thrown?
- Video demonstration of the problem.
- Syncfusion package version used.
- Grid code file.
- If possible share us a simple sample to replicate the problem or try reproducing it in the above provided sample.
If you are using older Syncfusion packages, then please update them to the latest version and see if it resolves the problem.
Let us know if you have any concerns.
Regards,
Sujith R