Hi ​@TDH 

Thanks for your post.

If your activity has pauses or stops that means there is no GPS data for that part of the activity and so it will be excluded from the heatmap. Only actual raw GPS points will contribute to the pixels rendered in the heatmap. Stacked GPS points may cause the heatmap data to appear "dashed" as well.

We are aware of a bug causing this to be exaggerated when zoomed out. We are continuing to investigate this issue.

When we get more information we will provide updates here. Thanks very much for your patience.