I do not have a lot of flying geese experience. I do know they are tricky.
That said, I'm not sure your measurements work to the situation.
I would graph it with accurate graph paper. 1/4" equals 1 square graph paper.
Draw your finished flying goose unit twice.
Then draw 1/4 seam allowance lines around the center unit, then around a wing unit (your red triangles). Cut these out of the graph paper. Now. Do these cut papers match what you are starting with in cut fabric units?
Your picture shows the red is cut into triangles already. Most instructions I have read for flying geese show sewing a square to a rectangle then trimming the corners off.
(Her center square is fine, it is only sewn on two sides.)