Task manager has wrong cpu speed

[Todd Greene]

I have overclocked my cpu ryzen 1200 to 3.8ghz acording to the bios and cpuz (and other monitoring software)
but the task manager shows a varying number between 2.8 and 3.2ghz.
why is this and can i fix it as I find it strange the number changes as if just a wrong reading it should be constant in my mind but as it varies but never exceeds the stock readings.
what is going on?

 

[Todd Greene]

this is even under stress tests

 

[Todd Greene]

as in even under stress where the cpu ramps up task manager never goes above 3.25
also the other monitoring software never says my cpu goes bellow 3.8ghz so why is this aswell