You cannot add a series with the "isekai" tag, it just gets removed when you hit submit. You can however re-add it afterwards by editing the manga page so it's not a huge issue. I'm guessing the "game" tag has the same problem since it's also listed at the end of the normal genre's, but I...
@Lucci Jiken means "case" like a detective case, and Jaken is just grammar with an accent from where the characters are from (around Hiroshima I think). It's added to the end as sort of a rhyme.
I bet you're wondering why there's two versions of chapter 1. Well we actually didn't know this was already being translated until we were right about to upload it. There was no indication on mangaupdates (perhaps because the other guy doesn't have a group name?) so we thought we were good to...