Both fans are four pin PWM fans, correct? Stock AMD heatsink, or something else? The case fan came with the case, or you purchased it yourself?
Are the fan settings you set in the UEFI, Automatic, Level 1, Target Temp, set to those values when you restart and check them again? They don't change in between boots?
The AXTU Utility, which in part can control the fan speeds, is not installed? If it is installed, it may be auto-running, and its settings will override the UEFI settings. The UEFI settings for fans are not automatically also set in the AXTU fan control.