Wrong max heart rate automatic detection

Hello,

I set max heart rate to automatic detection and I have 192. As I check every end of run the statistics I also check max heart rate. I never went that high nor can I find this 192 in any activity on garmin connect. The highest in all activities is 188. So my hr zones are wrong too...

Anyone with the same problem ? Or maybe it's not a bug but part of the algorithms ?

Thanks.