While playing one of my guitars last night, I noticed that one fret (the 21st) was raised on the treble side, causing a pleasant but completely out of place and unwanted sitar sound when notes played on G,B, or e and far worse is that playing the 20th fret on e sounds a horrible c# vs the c I would expect.
Is this normal seasonal fret sprout? That the guitar sits in a humidity controlled Armitage case and I've never experienced fret sprout before (I live in costal california, very stable temps and humidity) leads me to think this might not be.
What should I do?
Edit: I don't know if it makes a difference, but the guitar has stainless frets.
Dang dude, that doesn't sound good. It may be this fret sprout that you speak of. Can you try to gently tap the fret back down? If that works you might want to pull it and reapply adhesive and reset it. Otherwise, you might have to take it to a tech and get that fret dressed/crowned/replaced.