How can PH 7.8 + PH 7.3 result in PH 6.7?

[nullified]

Hi

Swim has some things he cannot explain, after swim gets his pure ghb [ph7.8], and adds water[ph7.3] to it, it sumtimes results in a lower ph[6.7] than the water itself was to begin with. Now swim thinks this cannot happen Unless, the mixture is reacting again, which it should not swim thinks... Anyone has different ideas?

And even if it is reacting, then how can the reaction result in a lower ph worth in this case? I mean lower than the water?

Thanks
Swim