List of steps to reproduce (step by step, including full links if applicable):

1. View https://zhwp.org/wiki/%E7%BD%AE%E6%8D%A2%E7%BE%A4.
2. View the directory.

What happens?:
You can see
2.1 '"UNIQ--postMath-00000014-QINU`"'`

What should have happened instead?:

No QINU.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:

I don't know.