I don't think there's any problem with the piece, it's more likely that it just got flooded by a bunch of other pieces right after you submitted. There were some spammy submissions in the last few weeks, where people submit a bunch of small, related pieces individually instead of putting them together.
PJ's moderation queue is set up weird in that apparently the mods can't reject/approve pieces beyond the newest 50-ish. As they get through the backlog, they'll be able to approve yours.

Do not resubmit it, as that'll make you lose all your public "yes" votes and just end up getting it buried again.