hlfan left a comment (openstreetmap/openstreetmap-website#5998)
I think I've found the culprit:
https://github.com/openstreetmap/openstreetmap-website/blob/32f23461fc37f93ba7fcddd901ed156d544c575e/app/assets/javascripts/heatmap.js#L23
getUTCDay is [0,6], weekInfo.firstDay is [1,7]
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