Rob Gronovius
I don't think it's strange at all. I think many new members join, and when they go to post their first post, they pick one of the forums at the top of the page. I don't think very many people stop to familarize themselves with the contents, the various subforums, etc.
Posting a question in the Welcome forum is a flavor of that. A new guy joins, notices that we do have a Welcome forum, makes his introductory post, then adds a question there, too.
Another flavor of this is to post all kinds of things in a forum that a person visits most. For example, if someone is an airplane builder, and spends most of his time in the Airplanes forum, he might tend to make all his posts there, and not split them out to the other forums, especially if he's never visited them.
And it's not just here in the FSM forum. I see this, in varying degrees, in other forums, and in other social media. It's particularly bad in Facebook, but Facebook's very design almost rules out any other posting behavior. On Hyperscale, it's very common for members to visit just one forum out of the entire selection, so all of their posts go into that forum.
I'm guilty of replying to Welcome posts, to suggest they ask specific questions in the other forums. I do it to help get the new member used to thinking in terms of the various forums, and so his question on a specific topic isn't hidden in the Welcome forum, especially given how weak the Search feature is here. I try not to worry about posts others make in the other forums, though, that really belong in a different one. Not worth the effort.