When adding cards, sometimes it happens that the cards are not added in order. This is considered a serious bug. If you test it, you may see the problem recur from time to time.
I found the cause of the bug.
When creating a new card, the card with Due number 0 is created as shown in the picture above, so even if the cards are set to appear in the order they are added in the custom study study, the card with Due number 0 appears in an odd order.
In conclusion, when adding a new card, Due should not be added as New #0.
I hope to test it once and let you know the result.
This is a bug that must be fixed.
For reference, I do not use addon, I use beta9 version of V2 scheduler.