'Years Employed' field seems 'off' on Worksheet - how is it calculated?

Summary

'Years Employed' field seems 'off' on Worksheet - how is it calculated?

Content

We're using compensation for our performance rating calibration function this year, and we've enabled the Employment field called 'Years Employed' to display on the worksheet.  We've also included Hire Date.  And based on the hire dates that show, I don't understand how Years Employed is calculating.  It seems to be giving more time to the employees.  In the screenshot below, you can see that based on their hire dates, each employee has not yet reached their 6 and 5 year anniversaries, respectively.  Yet, the Years Employed value is more than 6 and 5.  Why is this?