There could be a few reasons why someone might wrongly assume this. One could be that they don't fully understand the differences between Greek and Roman mythology. Since Percy Jackson uses Greek mythology and Vergil is related to Roman epic, they might wrongly connect the two. Also, if someone is only looking at the broad idea of using mythology in literature, they might make this false connection. But in reality, the characters, plotlines, and overall feel of Percy Jackson are far from being a fanfiction of Vergil.
Well, it's a really strange thought. Maybe some people are just very confused. They might see some superficial similarities in the use of mythology perhaps, but that's a huge stretch. Percy Jackson is based on Greek mythology and has a very different tone and style compared to Vergil's works which are more in the vein of Roman epic. It could also be that they haven't really read either properly and are just making a wild assumption.
Maybe it's a misunderstanding. Some people might not be familiar with the origin of Percy Jackson. If they come across Spanish - language fan - made content related to Percy Jackson first, they could wrongly assume that the whole concept originated as Spanish fanfiction.
Maybe because they are both popular in the world of fictional heroes. But that's a wrong idea. They are from different universes with different powers and story backgrounds.
Maybe they don't know the origin well. Some might be confused because of the huge amount of fan - made content around Harry Potter. There's so much fanfiction, fan art, and fan - inspired things that they might get mixed up and think the original was also fan - made.
It's a very strange thought. Maybe they are just misinformed or haven't really read either series properly. There's no real similarity between the two that would lead to such a conclusion.
I can't really think of a good reason why someone would think that. Maybe they misread some aspect of the story? But as I said before, the story is all about Greek mythology and Percy's adventures as a demigod, not security.
Maybe they're just really confused. The two have almost nothing in common, but perhaps they saw some fan - made crossover art or something and got the wrong idea.
Maybe it's a misunderstanding. Some people might be confused if they've seen some crossover fan art or fan theories that mashed the two together in a really strange way. But in reality, they have no real connection in their original concepts.
It's a wrong idea. Maybe some people who are not familiar with it misheard or misread some information. But as I said before, it's an American - made work.
It's likely a misunderstanding. Maybe someone who is not very familiar with both series made a wrong assumption. But as we know, Percy Jackson is about Greek mythology and demigods, while the Demogorgin is from Stranger Things, two very different things.
It's probably a misunderstanding. Maybe some people who are not familiar with the series just assume it could be Japanese fanfiction because of its popularity and some similarities in the concept of a young hero in a fantastical world that they might wrongly associate with common elements in some Japanese fictional works.