Thread:DoCheonGong/@comment-25239866-20170326110028/@comment-25122955-20170326122013

The problem happened on level articles with split difficulties. The previous regex based on (page code after revision). Since level articles with split difficulties mostly have their difficulty categories, these categories may cause a problem.

Fortunately, there wasn't find edit by other users before I fixed. Now it works fine on 'split difficulty' articles.