Kubo and his assistants are too fucking lazy to even double check the drawings these days. Remember how Shunsui lost his right eye (got shot by the guy with the pistols) just a few chapters ago and was wearing a goddamn eye patch? Where did that shit go?
Edit: Go back a few chapters to when their fight just started and you will see he's wearing the eye patch in every panel. Here
, and here
. This chapter it's missing in EVERY SINGLE panel. That's ridiculously lazy drawing even for bleach. For shame Kubo.