West is dealer GIBS at west, north and east all vulnerable.Bidding goes
Pass Pass 1 ♦X
2♦ X Pass 2♠
Pass 4♥Pass 4♠
Pass 5♥ Pass 5nt
Pass 6♥ Pass Pass Pass
Admittedly I suggested in the original X that I had something in all the other suits but I don't understand GIB insistence on ♥ in spite of my repeated bidding of ♠ especially when it had 4 of them. Can anyone explain this bidding to me?

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