We have switched to a new voting bot (more information here) a couple of days ago. Unfortunately in this transition some posts will "expire" (reach 12 hours before payout) before the next voting round, so they are removed from the queue. You aren't on a blacklist or anything, it's even happened to one of my posts!
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Thank you for letting me know, @amosbastian! Then it seems a good time to have a break from writing contribution posts until everything gets on the right track!