Weird graphic glitch?

I am having this ugly jagged coloured lines all over the background nebulae, but they only appear while in game.
I tried taking a screenshot but in the screenshot they are not rendered so you can’t really see my problem.

Now i took a photo of my screen while in game, using my phone.

Does anyone know what could be causing those ?

It’s been happening since a couple of years back, but i haven’t actively playing until recently so it bothers me.

It’s the same on different machines.

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