HyperX Cloud Headset Hz Gap

About six months ago I received my first HyperX Cloud headset. I was pretty excited as I got it $30 off normal price and thought it might be a decent headset, but I ran into some issues. The first pair had bad low range quality and a Hz gap at around 3.8KHz to 4.1KHz. For the low range, it had almost no bass and would put out hardly any noise until about 450Hz. For the gap, it would be ascending normally in db until it hit 3.8KHz then drop in db (if it was at -30 db, it would drop to -70 db) and ascend back up at 4.1KHz. The right driver was the worst while the left driver would drop 2/3 less (-30 db at 3.8KHz drop to -45 db).

So I called Kingston and had an RMA done. Three weeks later and I have my second set. Good news is the bass issue was gone. Bad news is it had almost the exact same Hz gap, but at 3.7KHz to 3.9KHz. RMA was done again, but it was the same story with the third set, but now it's at 3.5KHz to 3.8KHz. Both headsets right drivers were worse than the left drivers.

I will admit that this was tested with lesser quality equipment (phone EQ and internet range generator). However, even without using test equipment it was still noticeable when listening to that range. I got the same results on all three headsets when using them on my desktop motherboard built-in sound card, desktop front audio ports, Asus RoG G73JH, and HP Spectre X360.

Kingston doesn't have anything further they can tell me as they don't know what the issue is after two RMAs. Does anyone know what could be causing this issue?