Most breedesr will use and post the picture of the actual animal so when sold or on hold it will not become available again unless the deal falls through.
A few breeders however or sellers will use stock photos which means when sold out it will show that but soon as the morph is back in stock it will show as available again.
So this could explain why the animal is back on the market
If you bought from a REPUTABLE breeder and they acknowledge payment and you agreed on a shipping date there is nothing to worry about, the question is did you but from a reputable breeder?
Not really you either get the funds or partial funds (deposit) or you don't.I'm wondering if the increase in smartphone/technology that has happened in the past 6-7 years effects how fast buyers/sellers anticipate deals to go through.
For most breeder it's pretty simple if there is no fund or proof that funds are on their way the animal remains available.