With your ALK that high your PH should also be very high. You said a bunch of times you are not dosing anything, but then you said you raised your CA a whole bunch.
From 204 to 444 is a huge increase! Enough to cause all sorts of problems! What did you use to raise your Calcium? My guess is you used Kalk. If you used Kalk that would raise your ALK. and that would explain everything. I think it would be good to know your Magnesium level as well. Magnesium affects Ph and stability of ALK although I don't know how it would raise it.