First, I know Commander abilities don't stack. But these are two separate Commander abilities and they don't stack with each other. i.e. an Elf Ranger will not gain both Commander bonuses. Either allow them to stack or change the wording of Commander abilities to say "Commander abilities do not stack". I would also like to point out that Commander Ranger is pretty redundant in a ranger BG right now as the unit with Commander Elf is also a Ranger anyway, which at first I thought was the synergy of the commander abilities, until I noticed that they were not stacking.
I don't think this is a bug...They never stacked. Says on the ability 'this ability does not stack'. They are triggered for different classes/races, but they both grant the 'commanded' buff which only is allowed once.
That's my point though. It says "This ability does not stack". Commander: Elf and Commander: Ranger are not the same ability, they are not both covered by "This ability...". They should either stack or it should say "Commander abilities do not stack". Otherwise it's just wrong.
Interesting conflict. It is clear either the ability has a bug, or the description is wrong. @Senshu #MoreworkforGedden