Very strange...I can't think how that is even possible. Can you tell me your in-game and app config options, exact weapon and ammo you were using?
On that second video with the AKS-74u, the malf fix speed isn't supposed to be nearly that fast compared to me testing it just now. You said you're on SPT 3.5.0, are you also using the latest version of the mod? What other mods do you have installed?
A third complete reinstall seems to have magically fixed it... Was just haunted by ghosts or something, I guess. Thank you very much ❤