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I just cloned your form, and could not reproduce the issue, the new scheme was applied:
Clone your form and apply the change to the cloned version: https://www.jotform.com/help/27-How-to-clone-an-existing-form-from-your-account
Let us know how it goes.
I'm sorry I gave you the wrong form name. It's Member sign up by agent
Try the following:
1) Click on the Themes button.
2) On "Current Them", click on the "Remove theme" button, and save.
3) Then go to the Designer, apply the scheme you want, and save.
4) Preview your form to see the result: