apple watch 4 not counting floors climbed

This past MON (10/22/2018) I completed a 2,500 vertical foot hike with both my iPhone X active (using the Cyclemeter app, image below) and my Apple Watch 4 in Workout mode, and in Airplane mode as well to conserve battery life. Both devices/apps correctly recorded distance and heart rate. However the Activity monitor only showed 38 flights (2nd image below). It should have been closer to 250 flights. Any ideas what is going wrong? I have noticed the same issue on multiple other days.