Issue with offsetting inside an object

Hey guys. I’m having a problem with my offset tool I’ve never seen before. When i create closed winding objects (a street in this situation) & try to offset, the lines & arcs cross each other. The command works fine if I offset outside the object. It only happens when I offset inside. I’m designing a 40’ wide street with 2’ curb & gutter. I’m using sketchup pro 2018 & have been using sketchup for 15 years. Never came across this ever. Thanks

This has been identified as a bug and the team is working on it. I’ve found that welding the edges before offsetting seems to mitigate the problem.

The top one has the edges weld before Offset, the bottom doesn’t.

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Awesome, thanks. Thought I was going crazy.

Happy this helps.