We are aware that some users are experiencing issues with Library and Reading List sorting from Oldest to Newest. For some users there is no option to adjust this back to "Recently Added".
Our team is currently working on resolving this issue, but please feel free to reach out to us here if you have any questions. Further details on this fix will appear here.
Thanks again for your patience and understanding as we continue to get to the bottom of this!
-The Wattpad Team