Check and see if this is because you have 1 Product in the Radikal Technologies manufacturer and multiple Products in the Yamaha manufacturer and have the setting in the Configuration ... Layout Settings ... for skipping the listing turned on:
Code:
Skip 1-prod Categories
Skip single-product categories
If this option is set to True, then if the customer clicks on a link to a category which only contains a single item, then Zen Cart will take them directly to that product-page, rather than present them with another link to click in order to see the product.
Default: True
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