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Hello @celt
Welcome to the Bunnings Workshop community. It's wonderful to have you join us and thanks for sharing your question about your facia boards under your eave.
It's possible that the heat and moisture inside your ceiling has softened the hold of the nail to the fascia and it has let go and slipped out. Looking at the photo you posted, I don't see any large water marks which is a giveaway that there is a leak in your roof and water has damaged the fascia.
I suggest placing your finger inside the gap and check if the surface is soft and spongy. If it is there is a water leak inside the roof. I suggest addressing the leak first and then replacing and repairing the fascia.
However, if the panel is hard and dry, I suggest pushing the fascia back up and adding more more nails to the fascia panel.
If you need further assistance, please let us know.
Eric
