I thnk they were imported in several months, if not years.

I think it was because I did not include the timestamp information when I was importing the text. The import function is to import text from other wikis, but I used it to add text using manually created xml files. I sincerely express apologize to every Wikisource user, and to the Wikimedia Foundation. I apologize for the mess I've made, and the trouble it has brought.