Recoil is bugged in some Portal servers

On certain Portal experiences, the recoil animations for all weapons are bugged. They appear floaty and smoothed instead of sharp and responsive like they do in matchmade experiences. This leads to inconsistent feeling gunplay and weird gunfights. It almost looks like the animation is playing slower than it should. I have attached a video comparing recoil in a Portal experience to recoil in the firing range, although I'm not sure how well it comes across on video. It's very noticeable in gameplay, however. Pay attention specifically to the reticle's motion.