Raise borates to 50 ppm but didn't see any corresponding increase in alk

[Dead Beaver Ranch]

I've raised borates to the maintenance level of 50 ppm but didn't see any corresponding increase in alk. Alk was at 80 when I started and it's still at 80 now that I have completed adding all the Borax. Is this a concern, I thought alk would increase with the addition of the borax. I used Borax and Muriatic acid. Thx, DBR