Thank you for contacting syncfusion support.
We have checked your reported issue by importing the excel file in spreadsheet and the data loaded properly in our end in IE browser. Before that we would like to know the following details to proceed further.
1. Please share dummy issue replicable excel file.
2. If you have done any customization in sample, please share us the code snippet.
3. If possible please share us the issue replicable sample.
4. Share your Essential Studio product version and IE browser details.
Could you please get back to us with the above requested details? Based on that we will check and provide you a better solution quickly.
Vinoth Kumar S