Hey! Was able to repro by just adding a </c> tag to the end, and it looks like that's the cause? I'm finding weird alignment issues when using any closing tag at the very end and an even weirder one when using quads at the very end... Looking into how to fix this, now.
For now, you don't actually have to close off tags at the end of a mesh, so you can leave the </c> out and it should work fine?