Repair Imbalance?

So it takes 1 granite and 3 stone to build a stone wall segment. Not a problem (maybe too easy).
But to repair a stone wall segment from 6% to full takes 58 granite! Good grief...
Is this correct or a bug of some kind?
But to repair a stone wall segment from 6% to full takes 58 granite! Good grief...
Is this correct or a bug of some kind?