So a few days ago, I couldn't log in to my main and also my alt account.
About a few hours later, I was able to log in to both.

Today, I got messages of new activities in studios. However, I suspected something when realising these studios were unfamiliar. I clicked on it and said I was following it. However, I don't remember following any of those studios. An example is “Shards Games”. I checked my recent activity and never followed any more studios. These unfamiliar studios only appeared today. I can't even find the studios in studios i'm following!
Please explain and fix this glitch as the messages are multiplying due to this matter. Hopefully, this problem can be mended as soon as possible.