This time it's not moving at all (unless the page index is 3 or less), and my inventory is not full.
I have a hypothesis (since it was working a few minutes prior to the issue) that it is because I just unlocked a page in my personal bank. Do you keep track of the personal bank jump pages separately? If not, it might think my account bank (which has more pages) is as big as my personal bank. Although if this is the case I'm not sure why it will go up to 3 (my personal bank has only the second page unlocked, I don't have VIP).
Where is that file and JSON key I need to check to discover where it thinks the last page is?

Okay I checked the JSON data, it's right and I see that you have separate indexes stored. I have no other hypotheses so I will wait for a reply.
Edit: that said it did seem to start working again after visiting the final page... weird, maybe I'm on to something after all.