Path > Outline Stroke not working correctly (Sharp edges?)

[Marlo_]

So for some reason when I use the "Path > Outline Stroke" tool, it creates these really weird and annoying edge things that I have never experienced or seen before. Does anyone know how to fix this? It literally makes me unable to round off the corners of the shape.

[Doug A Roberts]

What did the object consist of to start with?

Does it happen on every corner or just particular ones? Can you share an example file with before/after objects?

[Ton Frederiks]

Does it also show when you change Preview from GPU to CPU (Cmd or Ctrl E)?

[Met1]

You've tried changing the mitre limit?