tp_forumdisplay_threadlist different display at forums under same category ?

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Assign the template prefix to each forum (if you assign it for the category only).

The } --> sign appears in your XThreads application forums only (that have a template prefix) or for non XThreads forums only?
If it's in your XThreads application forums only, check your custom template, especially if you're using something like <!-- .................. --> to comment out some code.