Because if you enabled this System - JFBCSystem , it will mess out your HTML code and cant override your HTML code. (Look at below screenshot)
Plugin Manager >>
If Enabled System - JFBCSystem > Save > Go to this page developers.facebook.com/tools/debug > paste your "example : discussion URL" > Click Debug screencast.com/t/7wZN0RkP > Final result : screencast.com/t/PD88VODWKbMq
-> screencast.com/t/q65YfM5xVu
-> screencast.com/t/hvq4hSjn
If Disabled System - JFBCSystem > Save > Go to this page developers.facebook.com/tools/debug > paste your "example : discussion URL" > Click Debug screencast.com/t/7wZN0RkP > Final Result : screencast.com/t/z3n1hOM3Se1
-> screencast.com/t/eTfRQuqlkNY
-> screencast.com/t/tr5DMrT1P
Can you see the different between above example?
If enabled it will override your original location discussion URL to naturallyborn.net/ , If disabled it will work it fine.
Notice : If you disable System - JFBCSystem , your discussion page below that "Sign in with facebook" and "Sign in with twitter" is wont't work already. --> screencast.com/t/89agl9K6
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