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Hi Barrett Warner,
First, my pleasure to assist you.
As per your description, please don’t worry, we can work together to narrow down and resolve the situation.
When you Create a Visio diagram with the wizard, Under What diagram do you want to create from data, check the template, e.g., you select Cross-Functional Flow Chart (horizontal), or Cross Functional Flow Chart (vertical)?
Meanwhile, to confirm whether this is a bug in a specific version, if you don’t mind (my humbly request please don’t mind) you may also try Data Visualizer add-in, which is available for Excel see information in this article for your reference: Create a diagram in Excel with the Visio Data Visualizer add-in.
I appreciate your understanding and stay safe!!
Best regards
Waqas Muhammad