I took a look all seems fine, and everything worked out of box with the settings (but it's the default settings except the changed colour for the single colour tm 1638 if i'm not wrong)Hi. Thank you very much for your time.
Something is tickling me, is it the original leds ? I've already seen somebody in the past trying to replace them with coulours leds and it was lighting all the time like what you are describing, or maybe a wrong polarity ?
If you simply plug the arduino and do not open simhub, does the leds light up ?