Alkalinity ? s

[Captainhemo]

Hi All
I recently purchased a Salifert Alk test kit suspecting my alk could be low in my 60 gal reef. I was totally shocked to see a result of 22dKH. Is this even possible ? I'm wondering if the test kit could possibly be " bad" even thoough its long b4 its expiry date.
Other test results:
Ca 420
PH 8.1 lights just on, 8.3 just b4 lights off
Nitrate 5 ppm
SG 1.023

Would my livestock even live in this alkalinity? I have numerous hermits, snails, a few shrimp 5 fish, lots of mushrooms, softies but did lose my lps some time ago. Coral growth has been pretty slow
I just mixed up 20l of new water and the alk tests out at 16dKH.
If I am to trust this test and try to lower my alk, how do i go about it w/o raising my Ca ? I am having a hard time beieving my alk can be this high with the Ca at 420.
Anyone have any suggestions/enlightenment ?
Appreceiat any input , thnx

Jay