The unshielded CTs in the pdf you cited are as I described.
The CTs suitable for use around cables are as I described.
Again, from the pdf you cited.
B fields induce E fields when they are changing.
The photo shows a badly behaving CT attempt that goes largely against the assurances you're providing.
Telling us it can't be happening is not helpful.
Lacking any further postings from the OP, I can't be sure of much... other than this is a fouled up install.
The goo on the floor certainly looks like it was melted down from the rigged up CT.
Please opine as to what you think is the cause.
