How does this thing actually work? For example, I have 2 workouts left before the end of the plan and my predicted FTP is 100. I delete one of the workouts and the predicted FTP drops to 98. Then, a minute later, I add that exact same workout back on the same date, but the predicted FTP becomes 99 instead of 100.
It sounds like things are/were close to an edge, and you’re seeing what could essentially be a rounding error.
Let me know if you have any other questions about this. 