From Wizz Air website:
Please be informed that all Wizz Air Warsaw flights will operate to/from Warsaw Chopin airport (WAW) until 26 October.
Thank you for your understanding.
Could mean two things:
1 - Wizz want to move back, trying to get a better deal at WAW than they had.
2 - Airport to remained closed until 26 October and Ryanair havn't updated there site.