I believe it is the same question that you asked in the ticket #1033333, you can check the reply to the mentioned ticket.
For anyone who's interested, the described behavior is logged in our systems a bug in the exporting mechanism of the HTML5 Report Viewer. When a report is exported to Excel formats from the viewer the result of PageExec
function is not displayed.
This issue was logged in our system for further investigation and improvement.
In the meantime, please consider exporting to other formats (page-oriented) if your scenario is similar.
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal
and vote to affect the priority of the items