What? I thought I already went over this with you. What is the pH of the water you are giving it? If it has too many alkali minerals, they will build up in the soil and raise the pH in your soil. You should probably be using R/O or distilled water, or otherwise nearly zero ec/ppm/tds water to avoid this problem.
I already told you how you can adjust your pH in your soil in your previous post/thread here: