Hi Andy Swanson,
Thank you for contacting Syncfusion Support.
We have analyzed your query by setting multiple headers in our sample, but we were unable to reproduce the issue. We are able to resize with all the headers. Please find the sample link below.
If the issue still persists at your end, please modify the above sample to reproduce the issue and update us with replication procedure. So that we will analyze the issue and provide you with an appropriate solution.