That's what makes fly fishing so interesting, the unpredictability of everything. Nothing unusual about that. You will probably find that conditions were slightly different from the other time you were there, causing the fish to behave differently. The ptn, and copper brassie, are probably closer to natural colours than the green brassie. Perhaps they preferred the more natural colour.
I have never really had too much confidence in a green brassie for yellows, but then I generally tend towards more natural flies anyway.
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