So this can't be right. The photo shows you can move the rebound spring vertically some 10mm when sitting on level ground. I can rotate the near side rebound spring but NO vertical movement, Hmmmmmm...
I hope it is not the same problem you had with the rear spring. It may be that the spring is suffering from being held in a completely compressed state for the entire sea voyage. Have you measured the length of the springs on both sides?