I occasionally noticed this with steam players. The shoulder parts, in this case my Valkyrie are the standard shader in the winning cinematic for somebody else, while for me it’s the normal marine shader.
Here is a clip of @Jaya_Soames stream with the end cinematic (Steam): https://clips.twitch.tv/ThirstyObservantPandaOSfrog-Di9ZYO-YCndzdYC5
End Cinematic on one of my Hunts with Trivanevil (I’m on Epic):