James is right about the different locations of the photographer, but I wouldn't be surprised if the dune behind the green has grown higher in the past 15 years, also. A lot of sand gets blown up off that beach by the prevailing wind from the west!
Bunkers like these are inevitably going to blow around and when you build them you just accept that the maintenance crew is going to have to roll with the punches. That said, it's way more work than I imagined as I have been extensively involved with the same process at Pacific Dunes, and we've gone in there to change a few of the worst bunkers to tone down the sand movement a bit. [It still moves a lot ... but rebuilding revetments every few years is not cheap or easy, either.]
I remember when Dan Proctor and Dave Axland were starting to build the bunkers at Sand Hills, Dick Youngscap was just laughing at them for being so finicky with the edges, because it would all be changed or gone entirely in a year or two.
Indeed, when we are restoring old courses, it's worth remembering that the pictures we use are a moment in time that may be impossible to maintain long-term ... kind of like Poa-free bentgrass greens
