I'm not an experienced reefer yet but from what I see, one of your tests is still off.
I found this on the web for you
Here's a chart that shows what alk should be in relation to calcium.
Alk meq/L Alk dKH Calcium ppm
0------------0-----------360
0.5----------1.4---------370
1------------2.8---------380
1.5----------4.2---------390
2------------5.6---------400
2.5----------7---------410
3------------8.4---------420
3.5----------9.8---------430
4------------11.2---------440
4.5----------12.6---------450
5------------14---------460
5.5----------15.4---------470
6------------16.8---------480
6.5----------18.2---------490
7------------19.6---------500
So either you alk test is off, or your calcium test
But wait to hear from others as I may be missing something
Good luck
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