Reading the heart rate chart

[Micmin]

If I touch the heart rate chart in the Fitbit app to get detailed values, I see that some (actually most) readings have a white dot and the value appears with a white background. However, some other readings have a black dot and dark background. See screenshots below.

What is the meaning of this difference?

Thanks!

 

 

[t.parker · Accepted solution]

Looks like an artefact of using enforced dark mode (if you use Android). Fitbit doesn't support dark mode.

[Micmin]

Thanks for the reply, confirmed! I disabled dark mode for the Fitbit app and the "issue" is gone.