Sorry about unclear topic, but i came about this situation, when playing over the misty mountains grim guest

If there are two stone giants at the staging area and galloping boulders is revealed from the encounter deck, does that surge activate twice?

PS: Sorry cant get any pictures rigth now, because our computer is broken so i have to use my phone

No, only once. Galloping boulders gain surge (no surge 2, or surge 3) even if it is triggered by more than 1 reasons.

Good and thanks for clarifying