I encounter this problem regularly on guitars which visit my business. Assuming a new and undamaged string and decent action, usually it's the saddle needing a tweak for intonation's sake. Less often it will be the nut slot not cut quite right, and even less often the crown on whatever fret will have worn one way or the other, or the fret might need reseating. A good setup job to determine and fix these things is a short and inexpensive visit, sometimes while you wait, and the result is a fine playing guitar. It has nothing inherently to do with the brand being crap, how old it is, or where it was manufactured, though some of these things might sometimes be a common trait on lesser guitars. Usually with all guitars some individual personal attention will be in order depending on the requirements of the player, and periodic tweaks due to use & abuse, wear & tear, and changing tastes & requiremnts.

It's not a big deal, but get it seen by someone experienced. In south-western Ontario it might even be me.

Peace, Mooh.