I can set maximum heart rate on my forerunner 35 and/or in the Garmin connect mobile app, and/or on the connect web page. I can also set the zones on the app or the web. When I log out, then go back in and check them, they are all correct. However, none of this seems to affect the zones shown in the activity. My Max heart rate is the correct 155 in the settings and the zones in the settings are the correct %. I synch the device. I go for a run, then check again. All ok. But in the "activities", the max heart rate is always shown as 172 with corresponding (wrong) percents. I cannot alter this. Why? What am I missing?