Here's the code for the Network setup grid. Looks like 2 are center, the rest of left justified and first one is unassigned. Looks like for your screenshot only the 2 center ones are showing up.
// Load headings into network list
wxListItem itemCol;
itemCol.SetText(_T("Network Type"));
itemCol.SetImage(-1);
GridNetwork->InsertColumn(0, itemCol);
itemCol.SetText(_T("Port"));
itemCol.SetAlign(wxLIST_FORMAT_LEFT);
GridNetwork->InsertColumn(1, itemCol);
itemCol.SetText(_T("Baud Rate or E1.31 Univ"));
itemCol.SetAlign(wxLIST_FORMAT_CENTRE);
GridNetwork->InsertColumn(2, itemCol);
itemCol.SetText(_T("Num Channels"));
itemCol.SetAlign(wxLIST_FORMAT_CENTRE);
GridNetwork->InsertColumn(3, itemCol);
itemCol.SetText(_T("xLights/Vixen/FPP Mapping"));
itemCol.SetAlign(wxLIST_FORMAT_LEFT);
GridNetwork->InsertColumn(4, itemCol);
itemCol.SetText(_T("Enabled"));
itemCol.SetAlign(wxLIST_FORMAT_LEFT);
GridNetwork->InsertColumn(5, itemCol);
itemCol.SetText(_T("Description"));
itemCol.SetAlign(wxLIST_FORMAT_LEFT);
GridNetwork->InsertColumn(6, itemCol);