Why on shabbos is ashrai said before returning the sefer-torah and on weekday (nusach ashkenaz) afterwards. This cannot have to do with kaddish tiskabel since this is also done on rosh chodesh where kaddish tiskabel has already been said like on shabbos.
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Aishel Avraham (Buchach) Orach Chaim 149 says that the reason that Minhag Ashkenaz returns the Sefer Torah before Ashrei on the weekdays was since there are some people that take off their Tefilin while they are saying 'יהי רצון שלא נבוש' which is in Uvo L'Tziyon and it is improper to remove Tefilin in front of the Sefer Torah therefore they return the Sefer Torah prior to Ashrei. However on Shabbos when people do not wear Tefilin there is no such issue.