Just noticed this on my Janome Horizon. I purchased the machine last September (I do love it!!!), and can't remember ever seeing this before. It doesn't make sense to me, because my feed dogs are down and my stitch length is set to zero.
Might well be that it's a perfectly normal thing and I'm only noticing this because I'm no longer so stressed out by the FMQ thing... But thought I'd check with this knowledgeable board, in case it's an indication of some problem that needs fixing.
Thanks in advance! You are always such a great community to come to for advice.