I have a PS4 and a Battle.net account linked to Bungie.net. The API is aggregating all six of my characters from those two accounts when I'm logged in on my PS4 account. This can be seen on Bungie.net when I view my profile. Switching the account back and forth from Playstation Network and Battle.net will clear up the bug. This is more frustrating from third-party apps like DIM, where multiple work-arounds are needed to clear up the bug including refreshing dozens of times, swithching platforms, switching between queries, and so on. This bug really isn't a blocker, but it is a constant inconvenience.