(Writing on a lot of percocet so forgive errors please).

The field you are in has a lot to do with how this is perceived. In my field there is a severe shortage of qualified and experienced people and so you are constantly being recruited. It is unusual to not move around quite a bit. They did ask in interviews why each job was left but nobody ever was concerned and I changed jobs about once every 18 months-2 years. Twice I was fired and even then I had new jobs within a couple of weeks and didn't have problems about having left 2 jobs in a row less than a year apart (obviously I didn't brag about having been fired but there were issues that made it so I could talk about why I left).

So my guess is if you're being recruited that moving around may just be part of your field that is acceptable. I'd look around and see how long your co-workers have been where you are now as a partial indicator.