Create a memoir document, with chapter, section, subsection and so on. Use document settings, demand everything numbered. Expect: chapter 1 section 1.1 subsection 1.1.1
On screen, I get chapter 1 section 1.1 subsection 1.2 Which is clearly wrong. "book" and "article" don't do this.The exported latex is also wrong, I get \secnumdepth{1} so the subsection isn't numbered. Manually changing secnumdepth shows that latex+memoir have no problems getting the numbers right.
Helge Hafting
