I've lost count of the amount of times I've seen an image of siblings hugging & it being labelled as incest...
I know that it's Andy & Leyley but that's not a valid reason to tag it as such & it still happens way too often without them anyway.
I'm helping gardening the incest tag a bit, and I notice this a lot. But I think its mostly just people tagging everything thats tagged "siblings" or "brother and sister" as incest without really looking at the picture.