User blog comment:DaNASCAT/Technical Update: June 20, 2016/@comment-27226474-20160621021203

"*We will fix an issue that could cause category code to be duplicated via the classic editor.
 * The reliability of the Help:Chat module widget will be improved.
 * We recently deployed fixes to improve the reliability of the community creation process.
 * Before the weekend, we fixed a bug that caused some images to fail to show in infoboxes."

- Technical Update: June 20, 2016

Finally, we get something interesting here. It was a lot of waiting, but it did the trick.

Andrew Cao  Wall  Contributions  Code Wiki  ''' 02:18, June 21, 2016 (UTC)