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sometimes I have similar (but not that strange) lines on my front disc...
I say sometimes because after harder brakings they disappear and gets back to normal...
the reason for your problem could be something with the pads.. there is something in the pad compund...
I would try some harder brakings from higher speeds (but with care! don't fell off the road and watch mirror if anybody is coming behind you!)
so after some brakings with nice hot discs (don't touch them) make a visible check... it might won't be a solution but you can try
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