Blinkt behaving strangely

Hi all, I’ve got a blinkt that I’ve just finally started using on my Pi 3 (a long-delayed “I’ll work on that” sort of deal) and right off the bat it’s behaving strangely. It’s taking this simple test code

from blinkt import set_pixel, clear, show, set_brightness

while True:
set_pixel(0, 0, 0, 255, brightness=0.7)

And spitting out this as a result:

Any advice or solutions?