Krone 5.50 4x7T out of time

My auction find from a couple weeks back for a mere $825, cheap enough I thought. Problem is the 3rd rotor seems to be halfway out of time meaning it's in the same position as rotors 2 and 4 causing them to hit. My question is what could cause this and how does one resolve this problem?

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Krone 5.50 4x7T out of time