This issue is happening again periodically. Whilst there wer some slow updates following the recent server issues, I've two over the last couple of days which aren't showing up on my heatmap.

I've tried changing sports and then resetting to no avail

Funnily enough on both today and Friday when the no-shows have been recorded I've done another activity which does correctly show up up. On Friday the first activity showed, but not the second. Today it was the other way round. I'm getting a bit fed up of this.