My server is having a problem

I was playing a aternos server. I was using pixelspark and I had a Serperior, Poliwhirl, and a nice house I built. When I left the server and came back in later on, my server did not save the progress I had done. It took me back to when I only had a Servine and my house was not there. I know that some didn't troll me because my pokemon were also not saved. I also tried stopping and starting the server, but that didn't work either. Is there any way to retrieve the data. If you can, it would be very helpful.