Career Site makes up disproportionate volume of Recruiting Submission Source Medium. Is this normal?

Summary: When reviewing Recruiting Submission Source data, we are seeing that "Career Site" makes up a huge volume (~53%) of candidate submissions. Sure, most candidates actually submit their applications via the career site, but I would expect to see more details about where those candidates actually came from before hitting the career site (i.e. a referral website, search engine, etc.). We are capturing other source mediums on some submissions, so I am not sure if these large "Career Site" source medium numbers are typical, or if we have some kind of configuration issue that's causing so many submissions to get attributed to the Career Site as the source medium.