It's not a bug, it's feature
On a more serious note, the red-blue effect is from the default gesture configuration. Remember that Diamond board has gesture recognition and it comes default with 5 gestures pre-programmed. See here:
https://m.youtube.com/watch?v=oHeOli1DUhUIf gou do not like them, just connect the board to the computer and disable Gestures. See more in the Diamond user manual:
http://www.ultrasabers-uploads.com/Diamond/Diamond_UserManual.pdfHappy spinning!