It should be. I just checked by going back to that post and the up-arrow is highlighted for only the Bisping comment/ picture. I remember clicking on it, I believe it was on Friday night.

Could it be a problem of communication between Steemit and the Steem block-chain, wherein my vote doesn't show up on the block-chain end but does on the UI side?

edit

I just checked out your link and went to that third picture comment, as you suggested, using control + f to look for my name, and I indeed found it within that section.

edit 2

You can see it highlighted when you click on the above screen-capture that I took of the page that you linked me to.