speedfan gon wrong??

[jaffacakes]

hi, i'm using speedfan to determine my fan speeds, but it's showing that my arctic freezer 7 pro is doing 15341RPM

but the most i've ever got outta this cooler is 2900, has speedfan gone wrong?

 

[jaffacakes]

the second fan speed is regarding my two front case fans as they're wired together.