Okey sorry, there was a little mistake in my question. So it shows me the 6 cores but it doesn't show me the temp of all 6 cores (there are only 4 vertical columns).
HWiNFO only shows 4 cores instead of 6. I got a Ryzen 5 1600 on a MSI B350 PC Mate Mainboard. The windows task manager is showing me all 6 cores (and 12 threads).