"In May 2023, the median annual wages for machinists in the top industries in which they worked were as follows:" I.e. we're only looking at the top paying job

"In May 2023, the median annual wages for machinists in the top industries in which they worked were as follows:" I.e. we're only looking at the top paying jobs. Then, look at that we're taking a yearly pay to calculate an hourly rate. Fifty hour weeks are more the norm.