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@Greenbank
Garmin's Optical HR is pretty poor, only really useful for non-active monitoring (i.e. doing all-day HR).
I don't think I've ever had a run (or even a walk) where the HR hasn't had some significant wobble to make the min/max/avg useless.
On runs I sometimes I see big jumps (up to the correct HR) after an initial lower period. On long walks it often jumps down after a period.
(Pretty much constant ~5.5kph throughout and my HR did not jump down from ~105bpm to ~60bpm whilst still moving.)
For anything I care about I wear the HR strap (HRM Tri).
(All of the above on a Garmin Forerunner 935 here)