I currently play a classical guitar that I have borrowed, and it has some tuning issues that I have never really had to deal with before. The intonation seems fine action is also okay. Also, once I get it in tune, it stays pretty stable. But I have two primary issues:
The nylon strings are very sensitive to tightening. I swear sometimes I barely touch the tuner and it immediately is about 20 cents higher.
The wound strings have a slightly different problem. Sometimes when I am tuning they can't decide what note they want to be. They start out on a certain pitch and then jump up slightly in pitch about 10 cents or so. After I have fumbled enough with the tuners, this problem goes away and I get stable notes.
I am not so sure if I am maybe doing something wrong, since I had never had this kind of trouble with guitars in the past. I always tune up to a note, never down, and when I slacken my strings I always stretch them a bit.
Can issues with the nut or tuning heads cause something like this? Has anyone had an issue like this before and was able to fix it?