I am fairly certain anyone who wanted to vote on hairstyles would have gone through them all. There was no reading, so attention span isn't really an issue.
If only 50% of the people understand the instructions, then yes there is a problem in how the instructions are put forth. The instructions are there, obviously. However, it's the responsibility of the person writing instructions to make sure they are clearly understood by all, not a select few. For me, I didn't see ANY instructions. I saw a post that linked to a female voting thread, I went there and there were a bunch of pictures. The instructions for voting were on a completely separate post that I hadn't seen until about 5 minutes ago.