Germany 5 Euro Cent 2018 A

https://en.numista.com/catalogue/pieces107.html
Here it says 2018 A is just in sets, is an error? Because I found this coin in circulation and I don't think is just in sets.

I don't know much about modern Euros, but coins in sets can sometimes find their way into circulation.... maybe if you find many of them, it's a mistake?

I'll let the referee sort this one out.

I think it's a mistake in Numista. Every 2018 mint mark has two year lines except the 2018 A. I think the normal 2018 A is forgotten here and your find is a confirmation about that.

Besides, the term "In Sets Only" is totally wrong. "In Sets Only" means a particular year + mint mark only exists in sets. For the years + mint marks that exist in sets as well as in normal circulation, the description should be "In Sets" or "Set Issue" and not "In Sets Only".