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no worries not bugged. I love talking guitar!! Pitch. the pitch is higher than the open D by an octave when working on the high e string tuned down and it is one octave lower on the low E string when tuning down to D. Both Higher and lower by an octave than the open D string respectively. We may have found the challenge. The D sound you tune to is not the same as your open D string. The Ds are separated by octaves. The note is still a D note. Your tuner likely recognizes the D note in any octave. If you are using a fixed pitch matching device like pipes or a tuning fork you would have to adjust for the octave by ear. Sounds tricky and it was for me until I learned the trick. It is all vibrations and the vibrations interact with each other in certain, specific, identifiable ways.