Yes, this seems to be some issue on their end. It's best you send a request through the Help Center, so this is properly followed up on. (Posting on the forums, creating Github issues, or trying to tag developers on github is really likely to go unnoticed by them) At the same time, you could request them to change so it will be listed as a Publisher sheets, like your Awfully Cheerful Engine is atm. And seems they set the game to be grouped as a "d20 System"-game, and not under "Dungeons & Dragons 5th Edition"(where most other 5E-based games are listed) From the Help Center : If a publisher is in complete control of a sheet and what updates are
done to that sheet, it is eligible to become one of our "Publisher
Supported" sheets, which is a special designation when choosing a
character sheet. If you would like your submitted sheet on this list,
please contact us through our web form with the subject line "Publisher Supported Sheet Which reminds me, I should contact them myself to resolve a minor issue I've forgot about a couple times already... 😅