Greetings from syncfusion support
From checked your query, at first we suspect that you are not defining width property in grid columns so based on that we have prepared a sample and validate your scenario to reproduce the issue but it was unsuccessful. Please refer the below sample for more information.
If you still had the issue, Please share the below details that will be helpful for us to provide better solution.
- Please try to reproduce the issue with our above attached sample.
- Please share your exact requirement scenario.
- Share your complete grid rendering code.
- Please confirm your package version.