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Garmin Forerunner Optical HR sensor issue

Hi all,
I received FR 745 last week.
About optical HR sensor, i noticed two green LEDs sometimes flash at different brightness level, upper one is brighter and the bottom is darker at the same time.
I have an apple watch S4 and the lights always blink in same brightness.
Is this a normal flashing pattern for garmin or i have a defect sensor?
Thanks.