I see the same behavior with 1.5.9. Some of the preset lights are dimly lit, some a little brighter than others. The hold, glide, unison and write LEDs have the same issue. It looks like some kind of "bleed through" from other parameters. For example, the unison, glide, hold and preset 0 buttons seem to correspond to different LFO shapes.
I guess it doesn't affect the sound or cause other problems, but it sure does look broken!