Of ~800 Commerce product variations, ~30 are not available for purchase on their respective display pages. These offending variations are completely set up like their brothers & sisters, Title, pricing, sku, and status. I see nothing wrong with them, through the /admin/ gui. But when visiting the display pages, for these offending products, Add to Cart is displayed as Product not available.
I can't find any information online concerning a similar problem. I'm also novice enough, to not know the best way to go about solving this issue.
Drupal and Commerce are the latest versions. If there's any other information I can offer, please let me know.