Hah! Yeah I also live on a neighborhood greenway street with a traffic circle in Seattle and the odd stop sign layout. It confused me for a year until I learned about the greenway program.

Seattle has plenty of traffic circles just laying around that predate the greenway program though.

I almost never see Seattle drivers blow through stop signs though, maybe people in my neighborhood are just more chill? :D

Mine was converted to a greenway pretty recently, so it may be that drivers just have old habits from before when those intersections didn't have any stop signs.