Cpu shows very lows temperatures

i just build a new computer:

 CPU:Intel Core i5 6600k
 MOBO:GA-Z170X-GAMING 5 (REV 1.0)
 COOLER: Cooler Master EVO 212

The problem is that i got impossible low CPU temperatures on my system (-1°C, -5°C , 0°C, 3°C ), even on, and before the cpu stress test (TJ MAX set to 85° celcius). On maximun stress, the cpu gets 33°C:

My ambient temperature is 20°. All drivers are updated except for the BIOS.

When i touch the CPU cooler i feel that is a little warm, not cold, not extremly hot, but i am pretty sure that the sensors are not working well.

Should i update the BIOS and try again? or should i ignore this temps?

Thanks!

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