Hi Daniel,
Thanks for contacting Syncfusion support.
We have validated your reported problem in ASP.NET application with RTE control. We were unable to reproduce your reported problem in our end, when clicking the submit button it will redirect to assigned url page. We have prepared sample to meet your requirement, in this sample when click the button in the default page it will redirect to about page.
We have attached sample for your convenience, which can be downloaded from the below link.
Please refer to the below link to know more about page redirection in ASP.NET.
Please let us know, if you need any further assistance.
Regards,
Muthukrishnan K