WHY? (offset tools)

why in line 6 when I offset,
the line is broken like that???

If you can share the file with the original curve, someone may be able to figure it out.

Amphitheater.skp (154.0 KB)

I need 10 offset for amphitheater stairs,

Remove the bad one and try again, works fine for me.

As @Box, I was able to delete the incorrect curve and then to offset 300mm (repeared clicks on the inner face) about 25 times without any problems. I thought that would be enough.
I have no idea what happened to your file.

you can send back the file? (after repaired)
I’ve try,
not work :frowning: