It's not really an issue, but I can't get my head over this thing. Why is my profile red? I asked a friend of mine if he sees it like I do, and he does. While every other profile I searched they're always grey.
Just jumping in here, Spotify uses a technique that some would refer to as 'Colour picking' that creates a coloured background automatically using an algorithm. In your case, it's chosen the red from your profile picture! ☺️ It doesn't always do it but it's pretty cool when it does, I personally have it on some of my playlists and also my profile in app!
A lot of playlists and accounts have similar, the algorithm looks at the colours of album art or a profile picture and then chooses one or creates a closest match and then uses this to create a pretty cool background. For example, see this playlist below.
If you are interested a little bit more there is a UK Broadcaster known as ITV where you can see some other examples of this cool technology in use - check this video out.