Phew got a fright when I saw your post but things are working. That activity has lots of subtle tempo/threshold efforts that are just a bit too short to be picked up as “intervals” by the detector. It has some heuristics like “a zone 3 interval must be at least 170 seconds”. It also won’t count a short sprint unless you did 4 or more of them.
I have a long outstanding todo list item to add those knobs to the “Analyse” dialog for tuning this sort of thing.