It looks like he bottomed out the barb onto the copper below and something had to give. I suggest for anyone attempting to tinker with their barbs to cut off some threads before screwing them back in, this way they can't bottom out and force the top upwards. And if that is not an option then remove the top when screwing the barbs in so you can see that the barb does not extend below the bottom of the poly (is it polycarbonate btw?) top plate.
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