I somehow broke my project file

Hey there!

I somehow broke my file it seems, does anyone have any idea what’s going on there?


When I append a model and move it around, some parts just stay behind suddenly

I have other models in the same .blend file already and I could pose those just fine so I must have changed something somehow without realizing

When I open the model file itself I can just move it around without any issues, so the problem is with my project somehow


^this is the broken project

And here’s the model I try adding

mediafire . com/file/i0nrgdxnbwcbdsn/RainbowDash_1-1.zip/file

Any clue what’s going on?