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HRM Pro + Cadence not accurate at higher SPM?

I was comparing the cadence from my HRM Pro + (I assume my Fenix 7 is getting cadence from it) to Stryd and I noticed that when I am running at higher than 183 cadence, the data between the two sensors do not match.  At less than 180 spm the cadence matches but when I am running tempo or intervals my cadence is usually between 185-200.  At these higher cadences HRM Pro + is usually higher by 2-3 spm than Stryd.  Anyone else notice this?  BTW, this difference doesnt bother so since I am just a weekend warrior but I am curious.