Thanks for stopping by man. Usually when the string buzzes on my guitars, it happens around the 14th fret and down from there. There might be two causes:

1. Your bridge might be too low and contacting the frets, hence the fret buzz.

2. The neck of your guitar is warped (twisted or bent).

In case #2, if it is twisted, the guitar I’d say is a lemon. There’s little you can do to remedy the situation.
If the neck is bent, you should check the straightness by “sighting”, check one of my tutorials here in how to check the straightness of your guitar’s neck.

If this is the case, tighten your truss rod a fraction and test it out.

Mark