You might have ran into this bug:
https://luceeserver.atlassian.net/browse/LDEV-1317There are a few options you can do:
1) Change the format of cfdump via <cfdump var="#var#" format="text" />
2) Disable JSON Preserve case
3) Upgrade Lucee (I'm not sure if 5.2.2.18+ is still a snapshot or in stable channel yet)