uv unwrapping has gone terribly wrong and i don't know what i did

The image on the left is the uv unwrap before, then i pressed a few buttons (all of them) , reset the uv unwrap and re-wrapped it. The right is the result, does anyone know what i did and how to fix it? I didnt change the model at all or the seams.
As i cant unwrap the rest of my project, even two squares being unwrapped results in just a straight line.

are all differnt modes of uv-unwrapping end up with the same picture?
If so, use a new empty blend-file and import the mesh into it - maybe the blend-file got corrupted(i doubt, but there might be settings …)

never mind, i just un-pinned the whole mesh and fixed it.