I'm new to playing guitar, I just started a few weeks ago. A buddy was at my house and decided it would be a fun "prank" to turn all of my machine heads in different directions while I was out of the room. I've spent the last couple of days figuring out how to retune it, I've learned the open string and 12th string should be the same tone but I can't get my G string to even tune. I use a tuning app on my phone called "Guitar Tuna" and it says it's +900, so I'm unsure what to do as every guide on tonation starts with actually being able to tune your open strings properly. I use a fender stratocaster bridge and messed with the saddle distance to the neck, but still no luck with tonation adjustments (and I broke my B string, yay). I haven't touched the string height yet, but they're out of whack as well, should that be my next step?