>>34
理由がわかった。
It turned out that it was coded and illegally bypassed rock54.
The string is converted to &#xx; format string and written.

I can't paste text, but it would be helpful if you could add the relevant text string to rock54.

https://i.imgur.com/KWMKHm1.png
http://www.shurey.com/js/labo/encode.html