What are your NO3 and PO4 levels? My Scolymia is my indicator for when my NO3 or PO4 is getting low, they are VERY sensitive corals. If either NO3 or PO4 starts to approach 0 it gets pale and bleaches. They also do NOT like very much light! My tank is very bright (386 PAR on the sandbed of a 27" deep tank) my scolymia sits in the shade of one of my rocks, if it isn't in the shade it starts to bleach in areas. My guess is you have a combination of things going on there, likely starvation from lack of nitrate or phosphate, and too much light. They are also very easily damaged, so it is very possible that the move is also the cause. Mine has never recessed like that, but I can tell you from my experience, that it is far more sensitive than any of the SPS I have.