When you create a scoreboard objective, then set the display to the list, it does not display it.
MC-57460
Scoreboard Setdisplay List Not Working In 14w25a
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Simplifying this ticket to the most prominent of the multiple bugs posted here. It is much easier for us to deal with bug reports when they contain only one bug.
I'm not sure I understand your report. Please provide steps to reproduce, with the exact commands.