They connected Cairne and Perenolde with Cenarius during that reset.
Some of the recent realm connections on both EU and US servers didn’t go smoothly and caused some issues (guilds / gbank disappearing / duplicated items on the AH, etc) for some realms.
There was a sticky thread regarding the connections done on August 4th but it got unpinned after a certain amount of time.
I’ve seen posts from people talking about the same issue you’ve had.
Here’s the link for that thread -