Did adding Alkalinity Buffer Daily cause my Calcium to Drop?

I have always done big weekly water changes so my Calcium and Magnesium were always very very high.



Calcium - Around 500

Magnesium - Around 1500



But lately due to my Alkalinity being Screwed Up I have been doing a double dose every day.



The Bottle recommends a single dose twice a week.



But my Alkalinity keeps dropping and dropping even when I do the double dose every day.



I checked my Magnesium and it dropped to 1410 while my Calcium dropped to 360.



The only thing that I have been doing is dosing all this Alkalinity.



Is that the problem?



I remember starting out that a book said that if you added Calcium, then the Alkalinity and Magnesium would drop.



It said that they are all related and changing their numbers changes the other numbers the opposite.



Is that true?



If it is how to you balance it?