Unfortunately the issue cannot be reconstructed locally.
Your demo works well in Chrome. Please, make sure that you are loading your web-page from any kind of web server.
we tested this on web servers also (Apache, IIS 7 and WAMP) still we are facing same issue. I guess DHTMLX Grid is not having support with cross browser when we use CSV.
Please check and let us know if any particular browser is required to test this we are using
Your demo works well in all pointed browsers.
Please, refer to the attached screenshots.
If issue still occurs - please, provide screenshots with the error. csv.zip (307 KB)