Looked at open tickets, but did not see anything. With the current version, when adjusting the buffs page. Leader of the Pack as well as Rampage give no DPS gain, but Heart of the Crusader does.

Is this for a character with the rampage talent? If so, then it is expected that the talent is providing the buff, and so having the buff ticked as well provides no benefit. If you spec out of Rampage, the LotP/Rampage buff will provide a benefit again.