Hi! I'm somewhat new to Warframe and I don't know much of the ins and outs of the game. I have recently been trying to scan Somachord Tones in Orb Vallis so I could get the main music. Problem is, I seem to be getting "duplicates" of the tones. I have scanned probably more than four Somachord Tones at this point but "Vapor Trails" seems to be stuck at two nodes out of four. It also happened to me earlier with "Null Unit" but for some reason it somehow progressed after about three tries. I was under the impression that Somachord Tones are always unique in that once I scan a Somachord Tone, it will always progress a song and not be a duplicate. Am I bugged or am I just extremely unlucky?