I would update my bios, check the vcore to see if it is at a steady rate (not dropping to 0.59v and spiking to 1.56v), if your voltages are steady and you are not seeing performance issues then I would say HwMonitor is just giving you false readings.
If inside the bios your voltages do drop I would look into your power supply, reconnect all cables, try different HDD SATA slots etc.