You cannot sort by multiple fields the way you are attempting to do it. Since order_date_end in not references in the query anywhere WP can’t use it.
Take a look at WP_Query Custom Fields section, particularly the part about “meta_query” which you need to use to filter or order by multiple fields.
Then look at the orderby section and the code example titled ‘orderby’ with multiple ‘meta_key’s
Let me know if you can’t figure it out from there?
