One view is a single image of a set with a like button. I think you need to find another multiple image post to test this out.
OK, so I can't find anything online. I received today in my Instagram notifications two "likes" for a couple of my pics. Here's the catch. Those pics were posted as part of a multiple image post about 2-3 weeks ago. But the likes are only for individual pics from that multiple image post. Checking my post, it has 30 or so likes for the multiple post. Checking the pics that are liked, they each only have one like from some guy I don't know. So it doesn't sound like my account has been hacked, as it shows that these liked pics were posted the same day as my multiple image post, but these pics do not exist in my account as individual posts, but at the same time I can't find any evidence that you can like only single images from a multiple image post. Can anyone explain?