Which fan cards were you talking about with respect to keywords? If any happen to be mine, I can comment on those or speculate on others.
I don't think I own any cards you've designed as of yet (though if any show up at this year's Nightmare Nights I'm totally going to grab them). I dug through my collection to pick out a few examples, though this isn't the full extent of them:
Discord, Jelly Filled from I think the Fan Pon expansion (one of many that has no watermark and no set name on the card) has the Draconequus, Elder, and Villain keywords but not his name keyword for some reason. Similarly, I have a Princess Ember card from a... rated T for Teen expansion that has the Ember keyword (and somewhat surprisingly, no Princess keyword).
King "Kingsley" Sombra from the Fan Pon expansion has the King Sombra keyword where others, like
King Sombra, Resurrected from the Alternate Universe expansion has the Sombra keyword (without the royalty). "Kingsley" also has the OC keyword and that bugs me a little.
Rock Breaker Pinkie from the Alternate Universe expansion doesn't have the Mane 6 keyword. All the other Mane 6 from that expansion
do have the Mane 6 keyword.
Con Dorks from the Fan Pon expansion has Earth Pony and Unicorn as keywords, while the ability states it can count for either for all Goals, Ships, and Powers.
Connie from the Gem Ponies expansion has no keywords, even for her race which appears to be Griffin.
I can understand a lot of these are just basically "bugs not caught in development", but I'm kind of anal retentive and these things and it makes them seem kind of sloppy. Others, like the Con Dorks, seem innocent but unnecessary.