Low alk swing that quick will bleach the lower part of the corals and a quick rise in alk will bleach the tips of the corals so sounds like it droped off quick
mag is ok at 1500 temporally
calcium at 500 is ok temporally
Alk at 8.3 is ok
Take all the dosing off line id say until the levels are back in range then slowly dial it back up, watch your corals to see if the bleaching stays or starts to spread
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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