Beeminder Forum overcounting Google Fit hourly steps?

I have a do-more goal for Google Fit steps using, but it seems to be giving me credit for walking further than I actually have. On, my data for the 18th shows up like this:

but Beeminder has way more datapoints listed:

The Google Fit app on my phone says I took 2126 steps on the 18th, which seems like about what the datapoints on add up to, but my Beeminder graph jumps ~4k steps on that day.

Is this a Known Thing? if it’s going to consistently overcount my steps by some factor, that’s pretty workaroundable just by ignoring the actual numbers on the graph, but I’m kinda reluctant to start setting the slope higher based on my current progress if this is going to stop happening at some point.

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