I found a strange glitch while updating our client’s Shopify store. They have this product called ‘Large Sign’ and each of its ‘Character’ variant should have a total of 4 combinations. But the ‘6 Character’ variant only has 3 combinations for some reason. Is there a setting for this? Am I missing something? I attached a screenshot of the product variants from the backend for context and its resulting variant combinations. I know the combinations happen automatically, so seeing one set being incomplete confuses me. Any advice is appreciated. Thank you in advance! 
MISSING COMBINATION: “English Letters - Beneath (+$25.00) · Black Frame w/ Black Back Board”
Pic below: screenshot of variants in the product page backend—
Pic below: list of variant combinations for the ‘6 Character’ variant—
