There was a lot of first-party planning when it comes to Destiny ranging from development to marketing. The first party was none other than Sony, so PlayStation 4 got some exclusive items, among them, being a rifle called the Wavesplitter. Well, the gun accidentally found its way into the hands of PC and Xbox players due to a bug.
Players had a very short window of time to get their hands on it, 45 minutes to be more exact. It went something like this, you go to Xur, you buy a Fated Engram and possibly receive the Wavesplitter.
The chances of being lucky enough to receive it aren’t the best, but some players did manage to get it. Obviously, Xbox and PC players having a PS4 exclusive weapon is a big no-no, so Bungie intervened. They didn’t delete the item from the player's inventory, instead, you simply can’t equip it.
At least you can keep it as a small trophy reminding you how lucky you were in a short time period.