Weird behaviour in timeline 3D Object Animation

[Benjamin5E29]

Hello, for me  really weird behaviour occourd. Im reguallarly making small 3d animations with Photoshop. I designed my objects as 3D elements and started edeting the 3d Mesh. All works fine. After the first time rendering the video i get this really weird misbehaviour. As soon as i move my timeline all of my objects will turn into the some object without any reasson. 

As you can see in the timelaps it just turned everything into one. But kept the different names 

Thanks for your help-