Brownbookcover

Yeah happened to me too, whenever you do the tutorial it resets all perks/cosmetics back to nothing. No idea why maybe it has to do with the game forcing you to play default perks/cosmetics when running it which gets rid of all the cosmetics

So from my independent research I think I have found the cause. Once you get into a lobby and in that min before the game starts is when this happens. If the killer switches to another killer it will show the previous killers power and no perks and if a survivor changes it will show no perks also.