When I was in Coach Jacek’s planner, I noticed two things.
The first thing is that when I refresh the planner every time, I get a different stress summary each time.
The second thing is that it doesn’t add up to the weekly stress when long rides are broken up into several smaller ones. He takes only the first part of several to the total.
Thanks the first one is a “as expected” 
meaning the workouts are randomly generated and stress is not such an accurate number that it needs to be perfect. There are so many life factors that affect TSS/stress and even a given workout at for example 100 TSS could change actually body stress by ±20% based on different factors.
The second one is a bug that needs to be fixed that I forget to check and make sure got done. We will fix this.
