I've done three tests with the various colored strip tab over the last four months and Total Alkalinity showed as zero on all three.
When you get strange results, it is probably time to re-evaluate your methods. It seems unlikely that you have zero Total Alkalinity - especially with spring water as your source. (Are all of the rock outcrops in your area sandstone, and your soils are very sandy?)
Here is a link to run a rough calibration for your test strips.
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.globe.gov/documents/11865/3c49828b-2490-4f7f-bbcc-513860138326#:~:text=Weigh%20out%201.9%20g%20baking%20soda%20and%20add,Rinse%20the%20500-mL%20graduated%20cylinder%20with%20distilled%20water.
You might try that test as you should have some baking soda in your kitchen.
Even if you don't want to do their precise recipe, you could test a solution and check your results. Then perform a 10:1 dilution and check your results again to confirm that Total Alkalinity is reduced roughly ten fold.
If not, then your test strips may be bad.
