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Heart Rate Zones are changing automatically

I have a Vivoactive 4 and I set my Maximum Heart Rate to 150 (220-My Age). The zones show properly and everything is fine for a few days.  After I  manually set it,  Zone 5 shows  as 135-Maximum. The first few bike rides are fine but then it starts to creep up. After 2 rides it shows as 139 - Max. After a few more it shows as 140-max. and after a few more it shows as 145-max. Why is this occurring?