The strange code you are seeing is encoding which hides certain aspects of your page from becoming autolinks - specifically, other BB-Code tag tags. This has been present since VaultWiki was created.
However, since you have an existing article that matches one or all of the word elements of the encoding ("CES", "XST", 1), an autolink is being created on the encoding. Then, since the encoding has been changed, VaultWiki cannot find where it is to remove it.
I will look for a workaround.