VBS Preview is not showing the custom form I have created

Summary:

I have recently taken over a project where the original build was completed by another consultant who has since left the business, the original configuration was completed in TEST then promoted to Dev environments to complete UAT. I've created a new project and workspace to update the forms.

Content (please ensure you mask any confidential information):

There were some small amends to make to the custom fields, which I've done and I've created the custom layouts fresh with the new/ amended fields. However when I go to preview the custom layouts I've created, it's showing me different versions of the layouts and not even the ones that were promoted from Test to Dev environments.