Rankings in Personal List displaying incorrectly

Hello,

I was updating one of my personal lists and I noticed that while the ranking is correct when the list is displayed, when I went into edit mode a number of the rankings were incorrect. This was exacerbated when I added new films to the list and tried to change their rank. Typically, I would have to enter a rank 3 places off in order for it to show up in the correct order, and sometimes even that didn't work. Other times, when I changed the rank for one film, two other films would change ranks despite not having been impacted by the initial change. And when I add a new film to the bottom, it displays the correct rank (even though the last film on the list above it displays incorrectly).

Additionally, I exported the list to verify the problem, and the rankings in the csv reflect what is seen in edit more and not in live mode.

I've included some screenshots to try and help demonstrate the issue. I've noticed similar minor issues when updating lists in the past, but this is the first time it's been a major issue for me.

Here's the list in live view. You can see that everything appears to be ranked correctly.

As you can see, instead of the films being ranked 12, 13, 14, 15, 16, 17, 18, they are 12, 14, 15, 15, 17, 17, 18. The only thing I can think of that caused this change was adding film #12 last year, and moving a film that used to be between American Beauty and Oliver! down to a lower ranking a few years ago. Nothing else has changed with those films since I created this list.

Additionally, here is the top of Page 2 in edit mode, which should start at #251:

Instead, it starts at 252, then 254, 254, 255, 255, 257, 257, 258.