Unpaired G-C at the nick of dumbbell structure

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cokiest
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Joined: 07/28/2015

Hi all,
I have a problem predicting this sequence:
GGAUAUUCGAC GAAA GUCGAGUAUCC CGGUAUUUGUC GAAA GACAAGUACCG
The G-C at the nick of dumbbell does not form base-pairing, could you explain why. I also tried to use other sequence combination near the nick, it seems that this is a special sequence.
Thanks.