Hi Hadas,
Thank you for your interest in Syncfusion Products.
I am afraid that I was not able to reproduce this issue. Please find the simple sample in the following link that illustrates this:
http://websamples.syncfusion.com/samples/Grid.Windows/F71773/main.htmPlease have a look at the above sample and if still the issue exists, could you please try reproducing it in the above sample or send us the reproducing steps so that we could sort out the cause of the issue and provide you a solution?
Please let me know if any concerns.
Regards,
Fathima