Hello,
I noticed, that if i set the Navigation properties on a page with an ecom catalog to the following, the Navigation XML is created with the group sorted according to how it appears in the Ecommerce Center (See the attached file Navi_correct.png)
If I, however, set the settings to select "Groups" and "All groups", the groups are sorted alphabetically and not according to the sort order specified in the Ecommerce center (See settings in attached "Nav_alphabetically.png")
[Edit] Minor detail, the Dynamicweb version is 9.2.17 :)