That seems like a typo. I think you would inc 9 sts on the sts between the markers. What's the pattern? It always helps if you can link to it or at least a picture. Or tell us what you're making and what part this is.
Yes, it's an increase 9sts in the first section before the marker evenly across the 28sts (so increase about every 2-3 sts). Increase 8sts evenly across the middle 60 sts (so increase about every 6-7 sts) and for the last section, it's again an increase of 9sts evenly across 28sts.