I have the same problem.
When exporting all of pages as JPG, not all of them are made.

Same problem also. How did you guys fix this? Should I recreate? This problem happened on tha last set of artboards. This project is supposed to be done.

Aim working on macOS Mojave

while creating artboards the number 22 is incorrect and shows as 23

Jup! Just got the same problem. Page 24 is called page 25.

I have the same problem. When this will be fixed?

When dublicating artboards (Alt + drag), the program randomly makes one of the artboards dublicate with the same number. When exporting the artboards, one of the duplicates is ignored and cannot be exported.

Have the same issue with Illustrator CC 2019.
Mine duplicated skip artboard 57 and duplicated 58
Deleting and re-creating artboard doesn't help. Number 57 is always show as 58.

I'm using Macbook Air 13"

I am exporting total 55 artboards but software is saving only 53. 02 are missing.

Having this same issue, but mine seems to happen more on higher number of artboards, usually 80+, but sometimes it happens at the lower numbers as well.

PLEASE HELP!!!

The numbering of artboards is consistently wrong in the newest version of CC 2108

When creating artboards, artboard no. 10 is skipped and two artboard no. 11 are made.

I have a similar error. Page 6 appears to be inaccurate. I have 7 twice.

1 Artboard 1
2 Artboard 2
3 Artboard 3
4 Artboard 4
5 Artboard 1
7 Artboard 7
7 Artboard 7
8 Artboard 8

Since Ashutosh had closed comments to same report (https://illustrator.uservoice.com/forums/601447-illustrator-bugs/suggestions/32026201-artboard-numbering-error), without getting it fixed, I will AGAIN add comment here.

This bug makes me loose money.
I've sent you an email through 'other support channels'.

This is more than just art board 7, it also happens at 21, 23, 27, 31, 37, 42....

Latest version of cc 2018 has a glitch when creating multiple artboards it skips 6 and labels two boards as 7 before continuing on. This makes it skip the 6th board when exporting due to the fact both are named 7.

All new documents but thanks - clearing preferences resolve it :)

when open more then 9 artboards, illustrator make the same page number for some of the artbords (look at the video attached).
it open 1-9 artboads normally the next artboard is no 10 but 11 and also the one after it also 11 then until 14 it's also OK but then no 15 artboard but 2 16!
it make very hard to export the artboard that have the same page number
and generally really confusing

When I drag to copy an artboard it creates a new artboard. So when i try to export that new artboard it shows error and says it doesn't exist.

It also happens the new artboard to have number that already exists.

I am running into the same problem and I it doesn't work to export artboards that get stuck within the numbering glitch.

Same Problem here.

It was caused specifically when duplicating having more than one artboards selected using alt+drag with the artboard tool. When tried to export, it just exported the first one, ignoring the second.
As well, restarting the Illustrator fixed it.