What do you think when you see a job listed for a long time?

There is a job listing I have seen on multiple employment recruiting sites for the past 5 weeks. Based on the wording, I can tell it’s the same job.

This job was on two recruiting websites for three weeks. It’s currently on a different website, and has been there for two weeks.

By recruiting websites, I mean employment agencies, not Indeed or LinkedIn.

I don’t know if they haven’t found the right person, or if they found someone who didn’t work out. Or worse, they found someone who ran screaming from the building.