My Heart rate zone is indicated to be based on a HFmax of 175 [Strava | My Performance]:

But when opening the Heart Rate Zone field to make changes, the listed Custom Heart Rate Zones don’t correspond to a HFmax of 175, but rather to 190 BPM. OK, the wrong zones are not checked, but the correct Max Heart Rate is checked:

So, you may think they don’t apply and are just some default values. But indeed, they are very well applied. Just have a look at the Heart Rate Analysis of one of your trainings and you have the proof:

Therefore, I calculated my zones by myself and entered them as custom zones, not basing on the first option to enter the HFmax any more!

I’m wondering, did I get something wrong or is this a bug in Strava? Any comment would be welcome!