Switch to using PaperSpigot (you can still you all of your current yml files, this replaces Spigot and adds 1 yml file)....once loaded, check to see if your problem still exists. If so, go into the paper.yml and set enable-player-collisions: true (I can't remember the default setting).
I usually test all ideas before replying, but it's 1am and I'm exhausted.
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For immediate assistance, I can usually be found in-game at: play.haleymc.net