Weird issue with MSI afterburner

[DetailedPack70]

ive found a weird issue with my custom built pc once i started to overclock my GPU. The issue is that when i either manually adjust the fan speed via afterburner or the fan curve graph allows the fans to speed up according to temperature, ALL of my fans in my pc ramp up. i thought only the gpu's fans was supposed to ramp up. I have 4 120mm coolermaster case fans, 2 for intake on the front of the case and 2 on the top for exhaust also the ones on top are connected to a 240mm coolermaster AIO. my fans are all connected to fan headers on the motherboard although each pair is using a splitter. is this an intended afterburner feature? any help is appreciated. 

My PC specs are:

AMD ryzen 5 3600

coolermaster 240mm AIO

nvidia GTX 1070

gigabyte B550m DS3H

corsair vengeance rgb pro 32gb 2x16

samsung 980 500 gb SSD

EVGA GQ 650w