I was trying to run some test code using a strip of addressable LEDs and my Arduino, but every time I ran the program, I got odd colors and the last LED color was green. Sometimes I would get a stronger color in each LED - especially when trying to set them to all white. In my case it was Red, Green, Blue (repeating 1 time) then all the other LEDs were unlit.
It dawned on me (later than I would have liked) that the order of values was wrong for the LED strip I was using (you can visibly see the large White diode in each white square). I had initialized my LED strip (using NeoPixel) to NEO_GRB instead of NEO_GRBW as my strip has a dedicated white LED. My major mistake here was that I thought I had a strip of WS2812B LEDs but really they were SK6812RGBW LEDs.