The issue being discussed in this article is:
The following is the cause:
The Rack Units field for that product is null or incorrect.
The following is the resolution:
1/ Double-click the rack shape to open the Edit Product form.
2/ Click the Specifications tab and fill in the Rack Units field.
3/ Save and Close the product, and the rack shape in Visio will look as expected.
If you don't know the rack units off-hand, you can find that info in one of the Description fields for the product.
You can also search the web for the specs on the rack.
If you cannot resolve this issue, please open a Support Ticket.