Sure. There are a few ways this can happen. One is if the user is in a hurry and just glances at the Snap story view. Another is if there are technical issues like slow loading, which might prevent the user from seeing more than the first story. Also, some people might be only interested in the first story and deliberately stop there.
I think it depends on the individual's habits and the nature of their Snap usage. Some might be very selective and only interested in the first story if it's from a specific person or topic. Others might be more likely to scan through multiple stories. There are also those who use Snap more casually and might stop at the first story just because they're not that invested in seeing all of them. Also, if the first story has a lot of information or is really engaging, it's more likely that someone will only watch that one.