Please, check the following KB article: Problem: Telerik Reporting renders blank pages
where possible causes are listed and solved. Coloring differently the items in the Report Header might help you to figure out which is too wide.
I can suggest you to create an unbound group instead of using Report Header and move the report header data there. Then from the Telerik menu in VS, choose Group Explorer and set the GroupKeepTogether property of the group you created to First Detail or All.
Let us know if you have any further questions.
the Telerik team
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