Thanks for Contacting Syncfusion Support.
We have analyzed your sample and found that you are referring segregation files and ej.web.all.min.js file in your project .Please find the screenshot.
While using segregation file no need to refer the ej.web.all.min file and without referring the ej.web.all.min file grid render perfectly with scroller.
Please find the screenshot.
We also found that segregation files version and ej.web.all.min file version are mismatched in your project.Please refer the same version while using the segregation file and ej.we.all.min file.
For your reference we have modified your sample and same it can be downloaded from the following location.