HRM 600 Avg GCT Balance off?

Has anyone else experienced a consistent ground contact time average that is outside the expected norm with the HRM 600? I've owned several straps (HRM Pro, HRM Pro Plus) and have used the Stryd pod, and my avg GTC Balance is always within 1% of 50/50, but since I began using the HRM 600 last week, it's off 3-4+% every single time. I have made sure to position it correctly on my chest, to no avail. A typical comparison with a similar run:

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0 Jan502 3 days ago

Something is steange with hrm 600 .

One day i have balance 60/40 next day 50,1/49,9

Too big difference i tried Bluetooth or ant both the same issues

0 xyan 3 days ago in reply to Jan502

I have the same. With all previous HRMs and Stryd 49-51 with 600 my first run was inline my second it was 44/56???

Third inline again. Will continue monitoring and if it happens again I’ll contact support.

0 Jan502 3 days ago in reply to xyan

Interesting if this issue with hrm or with software, because i dont believe this is truth data

0 xyan 3 days ago in reply to Jan502

Now that I see the graphs in detail in all my runs with HRM Pro plus are green and some orange here and there. All the runs with the 600 are orange and red with some green. I guess I’ll be contacting support. I’d suggest you do the same so maybe if it’s SW related at least they are aware of it.

0 xyan 1 day ago in reply to Jan502

Contacted support and there is now a ticket opened. Investigation is going on if SW or HW related. On another note I went to run again with it and was explicitly dragging my right leg. Stryd Duo showed 58R/52L, HRM600 was showing 49R/52L

If I run normally where all other Garmin bands show almost 50/50 and Stryd too, the HRM600 shows 45.5R/54.5L

Oh and the vertical oscillation is also higher than all the others. 7-8cm contrary to the 10-11cm on the HRM 600

0 phxrising 1 day ago in reply to xyan

Nice work. I have opened a ticket as well and sent over some comparison data for their reference.

0 xyan 1 day ago in reply to phxrising

U2. I will update this post on the feedback I get. Till then I will use only my Pro Plus.