Conversation

In early June I pre-ordered an Audible audiobook that was set to be released on June 20. Then shortly after I got a notification saying the release was postponed to September. Scarcely 3 weeks later I get another, saying it's now coming out in late January. (The hardcover and Kindle editions are already out.)

I find this puzzling, but I also know next to nothing about the moving parts of audiobook publishing; would someone be kind enough to suggest a likely explanation?