Hi Tarik,
Greetings from Syncfusion support
We have checked your shared information and based on your query we have prepared a sample and try to reproduce your reported problem at our end. But it was unsuccessful. Please refer the below sample for more information.
If you still face the issue, please share the below details that will be helpful for us to provide better solution.
1) Please share your Syncfusion package version.
2) Please share your complete Grid rendering code, we would like to check how you are customizing in beforePrint event of Grid.
3) Please confirm if you have used any custom CSS.
4) If possible, please share any issue reproducing sample or try to reproduce with our above attached sample.
Rajapandi R