Using the ASPxNavBar as the main navigation for sharepoint

Hello Chris,
I suggest that you try providing correct data to your ASPxNavBar control by handling its GroupDataBound and ItemDataBound events in the manner it is described in the following Support Center issue: ASPxGridView - Popup Edit Form not working correctly in Sharepoint
In particular, you code could be similar to the one below:
    protected void ASPxNavBar1_GroupDataBound(object source, DevExpress.Web.ASPxNavBar.NavBarGroupEventArgs e)
    {
        PortalSiteMapNode node = (e.Group.DataItem as PortalHierarchyData).PortalSiteMapNode;
        e.Group.Text = node.Title;
        e.Group.NavigateUrl = node.Url;
        e.Group.Target = node.Target;
    }
    protected void ASPxNavBar1_ItemDataBound(object source, DevExpress.Web.ASPxNavBar.NavBarItemEventArgs e)
    {
        PortalSiteMapNode node = (e.Item.DataItem as PortalHierarchyData).PortalSiteMapNode;
        e.Item.Text = node.Title;
        e.Item.NavigateUrl = node.Url;
        e.Item.Target = node.Target;
    }
Thanks,
Andrew