May 19 2019
The problem is happening in Chinese Wikipedia. Mainly when saving pages, sometimes accessing pages. Some visual features (incl. the interface) sometimes cannot be rendered properly.
Update: From what I observe, the problem I face has relieved at the recent moment.
Feb 23 2018
Aug 5 2016
No. When I turn on the gadgets, turn off WikED, add something by using wikitext editor, then the problem can still be reproduced.
I just done it recently, it seems that no problems are there.
Apr 24 2016
As the man-in-charge of TWA in Chinese Wikipedia, I can identify that the cause of the problem comes from https://zh.wikipedia.org/wiki/MediaWiki:Guidedtour-tour-twa1.js . A local sysop has this problem solved.