ETA not calculating correctly for some decks but not others

[psolarpunk]

Bug/Issue Description
Decks not counting in ETA, even after deleting and reinstalling add-on. You can see in the screenshots enabling/disabling my Kaplan/UWorld deck only changes my ETA by a small fraction. My ETA is only based on my AnKing deck

To Reproduce
Steps to reproduce:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Screenshots/Visuals

System/Debug Info
You can get this from Anki in Help -> About -> Copy Debug Info,

Additional Context
Any other context that might seem important.

[psolarpunk]

And it's even different when you go to actually study that combined deck