I got DLC characters for free? Please explain

I purchased Dragon Ball FighterZ (FighterZ Edition) on Nintendo Switch years ago and haven't purchased DLC beyond season 1. I haven't played the game online in a while because I didn't want to renew the online subscription.

Today I decided to play Dragon Ball FighterZ online with a 7 day free trial and something weird happened, I suddenly had Lab Coat 21 and every character from season 3 except Kefla unlocked somehow. They don't seem to be limited, and they're working in offline modes too. The eShop page says I haven't purchased them.

Can anyone explain how this happened? Is it a glitch? Is it related to the Z Union or something? Has this happened to anyone before or is it just me?