XSS weekly goal fluctuating?

Since the big update I can’t figure out why my XSS numbers, both total and what is needed to each of the low/high/peak seems to change every day?

I like to have an idea of how much I need to do for the entire week so I can plan out my riding ahead of time. I need 2-3 days to recover after a day of high/peak XSS work, only to see the target change after uploading the ride. Many times it adds more, which I can’t complete because I’m now too fatigued.

What am I missing? For example I checked total XSS needed for the week before yesterdays ride and it was just above 800, I did a 120 XSS easy endurance ride and now today it tells me I only need 550 for the week. Huh?