Weird Salt Reading in a Non-SWG with salt

[smallpooldad]

The pool is 9000 gal gunite in Hawaii, at an elevation of 1000ft so nowhere near the ocean. The salt measured 400 ppm before putting in additional salt to raise it to it to 1400 ppm using Ben's calculator. Now several weeks later a Taylor Saltwater kit is showing 3000 ppm (15 drops)? But TDS is registering 1800 ppm when it was 560 ppm before. This is weird!

The water feels great, no stinging of eyes, and virtually no salty taste.

But where did this additional salt come from or is the reading or kit bad? Is it bad for the pool to be at 3000ppm?

Use Wal-Mart's liquid bleach, muriatic acid, baking soda, the blue stuff, and Algaecide 60. Have always had an iron problem from flying red-dirt (ferric oxide AKA rust) but this is under control.

Temp 80 F
pH 7.4
Alk 100
Cl 6.0
Hardness 375
CYA 50
Salt 3000?
TDS 1800
Pool Crystal Clear

Help!