Why would my reddit request to a sub with 300 members denied?

I have experience, active in all my communities, don't have any warnings that I know of. I recently appealed two subreddits that way bigger than this one and was successful.

None of my communities have 100k weekly visitors so the amount shouldn't be an issue.

This is a subreddit for an indie game that I support through kickstarter and I am in contact with the creators. They said they didn't created it and would like to see stuff posted there as well. They gave me thumbs up about it.