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I also have a high max (~213), so that aspect of your data is not unbelievable. It's also possible to run at 90-95% of max for >10km but, as others say, you'd know about it.
I have seen the same odd patterns for HR profiles from wrist-based HR and chest straps. I have a suspicion (though I obviously can't prove it) that some devices employ error correction techniques that simply rely on spotting extreme values. If you're in hummingbird club then you might sometimes get these strange traces as a result.
𝔒𝕨𝖑𝘡
That parkrun heart rate data is from a chest strap and have had very similar graphs the last 3 weeks for parkrun... my maximum heart rate does seem to lie outside the statistical "normal" range, this is from a half marathon a couple of months ago - it looks like credible data until the 17km mark.
Resting heart rate is fine.