For some reason I cannot tune my classical guitar, I've used phone apps and actual tuners. I'm starting to believe that the issue is that the guitar is too cheapy. I bought for 100$ from the brand fender. I'm especially having problems with my low E string, it sounds terrible. I replaced the string and it still sounds the same, it has this very high pitched sound. I've tried to make it lower pitch and it sounds even worse. I'm not sure what to do at this point. All the strings sound so plastic like instead of a more savory sound a classical guitar is supposed to have. I'm not sure what the brand of the strings are originally when I bought it but I bought and used DAddrío pro larté nylon core normal intention classical guitar strings if that helps anyone.
It could be a problem of distances between the Nut and the Bridge, or maybe the tuning peg does not allow you to be as exact with the turns. However, if this problem is increased by playing a note somewhere on the fret, you could add a neck bend problem. Cheap guitars are usually a mess with tuning.