Try to disable all custom styles that you have on the page and test to see if the issue will disappear. If this suggestion doesn't help, then I will need more detailed information about your case:
- What is the version of Telerik assemblies that you are using?
- Does it happen on all browsers?
- What is your browser?
- Please paste your code here or include a link from where I can download your project.
This will allow me to debug your code locally and troubleshoot the issue.
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