200e

Hi. Perhaps someone can explain something for me.
When editing the quantize function on my 250e , i choose 
between l.e.d. off (no quant) and l.e.d. green (quant on). Then i 
leave edit mode , and when the sequencer is running i get a
red l.e.d. on some steps. what is the meaning of the red led?
thank you.
Joe Pascarell