False CPU temperature readings on AMD platforms

The temperature readings on my platform are completly messed up.
If i boot-up debian the temps are normal like in the 30-40°

But FreeNAS shows temps above 100° They are wrong in the GUI and the output of sysctl.

I also tried to different motherboards. First the ASUS B350 Plus and now the AsRock X470D4U

The new mainboard has an IPMI, so i can confirm that the temps are not near this temperature at all.

Output from sysctl:

root@lizzy[~]# sysctl -a | grep -i temp
device amdtemp
device coretemp
net.inet6.ip6.use_tempaddr: 0
net.inet6.ip6.temppltime: 86400
net.inet6.ip6.tempvltime: 604800
net.inet6.ip6.prefer_tempaddr: 0
hw.sfxge.restart_attempts: 3
hw.usb.template: 0
dev.amdtemp.0.core0.sensor0: 99.5C
dev.amdtemp.0.sensor_offset: 0
dev.amdtemp.0.%parent: hostb0
dev.amdtemp.0.%pnpinfo:
dev.amdtemp.0.%location:
dev.amdtemp.0.%driver: amdtemp
dev.amdtemp.0.%desc: AMD CPU On-Die Thermal Sensors
dev.amdtemp.%parent:
dev.cpu.15.temperature: 99.5C
dev.cpu.14.temperature: 99.5C
dev.cpu.13.temperature: 99.5C
dev.cpu.12.temperature: 99.5C
dev.cpu.11.temperature: 99.5C
dev.cpu.10.temperature: 99.5C
dev.cpu.9.temperature: 99.5C
dev.cpu.8.temperature: 99.5C
dev.cpu.7.temperature: 99.5C
dev.cpu.6.temperature: 99.5C
dev.cpu.5.temperature: 99.5C
dev.cpu.4.temperature: 99.5C
dev.cpu.3.temperature: 99.5C
dev.cpu.2.temperature: 99.5C
dev.cpu.1.temperature: 99.5C
dev.cpu.0.temperature: 99.5C
kstat.zfs.misc.zcompstats.attempts: 13374

Could it be that these temps are shown in fahrenheit instead of celsius?