I just completed the "Genetically Popped Collar" collection, but the rewrad was only 5 source marks, not the Super Rebellious Jacket. What happened? I'm a little uspet.
There's several collections that are the same way, I don't remember what the exact reason is, I think it started as a glitch, and giving the item via the Welcome Grant Pop-Up was their solution. Or sometimes you get the item in an email.