As demonstrated in this video: https://youtu.be/TaxJLWyTiFI
There is a bug with ramps in various TF2 maps where collission bounding boxes interfere with projectiles of weapons like the Pompson, the Wrap Assassin and so on. Basically, if you're on a ramp your projectile gets stopped on an invisible boundary.
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As of today, a fix has been applied to every server that fixes this problem and allows everything to work correctly!
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This fix was written by a dude named bakugo so we thank them for that! Also want to give thanks to shounic for creating the video that helps explain this problem. Also a shout out to Alpheri for mentioning this happens as well, it drew my attention to the video when it showed up on my feed!