Maximum Heart Rate here 144 & 171 while 175 at Strava - WHY?

for my max effort indoor ride today, July 9th:
Strava this activity maxHR=175
interval.icu same=activities/7439190412 page maxHR=171
interval.icu fitness page same activity maxHR=144

HRmax is set manualy. You will almost surely have artefacts sooner or later from your HRM and you don´t want those to update your HRmax. Go to the settings page and set your sport specific HRmax.

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You need to bump up your max HR. That activity has been clipped. You can see the orange bar on the HR chart.

Go to /settings and edit your max HR for the sport. Then go back to the activity do Actions → Update zones:

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Thank you for explaining.