Hi,
i am trying to modify this design (i saved schematic and PCB layout in a new project folder) but when i click "Import Changes" it tells me that i added all the components and i basically have to start from scratch:
Also 3D view is without components.: https://easyeda.com/wagiminator/y-cn3801-lifepo4-solar-charger_copy_copy
With this one it says no changes and all good and i don't have to replace any component:
And here 3d view is will all components: https://easyeda.com/wagiminator/tp4056-lipo-charger-ls
What is the reason for that? And most important. How can i fix it?
Any idea? Thanks. That would save me a lot of work
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
For the first part of your question about components being removed and replaced, please see:
https://easyeda.com/forum/topic/How-to-solve-PCB-components-removed-and-added-after-Import-Changes-or-Update-PCB-9dbbeabbfdfa401986fa1d03b2316245