EDIT: This question is as suspected a duplicate, so please check out the former post. Sonic's answer explains in detail how people end asking questions on Meta. Journeyman Geek has also a question asking how the problem of lost people can be solved. A better quantitative answer from Shog9 how people end here is found here.
There are sometimes questions inside Meta where obvious new and inexperienced users are asking questions belonging to a site.
How do those users come to Meta? My experience is that you don't enter Meta accidentally. Do we have an non-obvious UI problem? If we track how they enter the site, is there an obvious route which can cause that an inexperienced user ends here?
Or do we have so many questions that those users are simply unpreventable outliers who do not care where they land and dump their question into Meta? :/