Board Game Arena

I had a bird on the 4th spot in the grasslands that could move to another habitat. I then put in the 5th and final spot a bird that let me repeat another birds brown power, thinking I could then move that bird and the original bird, but I ended up not being able to use that particular brown power.

https://stonemaiergames.com/games/wingspan/rules/ (emphasis mine)

When a bird says that I can “repeat” another bird’s ability in the same habitat, how does that work?

You can choose any other “when activated” bird in that habitat and perform its power. The bird can be to the left or to the right of the “repeat” bird. The “repeat” bird does not copy the power for itself, but allows another bird to activate twice this turn. So if Bird A says, “Lay 1 egg on this bird,” and I activate a bird (Bird B) that repeats Bird A’s ability, I lay 1 egg on Bird A.