Check this out !

so ya your soil ph is good but as soon as you put in your 7.1 or even higher after nutes it way to high.. I no you can get cheep water ph tester they dont last long though and there kinda gay to use but its better then nothing. by the way you plant looks great hope tho's spots dont get any bigger, you should look at the fert burn on my plants lol

At first i was watering directly from the water of my house. But this water has many salts in it......(i was not using nutes then) So the ph went up to 7,2...then i add nutes and that's where this little problem started. now that i used already one time distilled water i think that they are gonna be ok. I had a similar prob with an old grow where i noticed rocks of salt under my pot. Fuck...u need to had seen that!!! The household water sucks and is the best way to kill your plants and still wondering WHY???

I still think you need to test the ph of distilled water with ferts in it

So i just tested the PH of the distilled water with the nutes in it and the PH was about 6-6,5 . Just for my curiosity i tested the PH in the water of my house without any nutes in it and it was 7,5-8. Now i know what the problem was. I have already watered once with the distilled water and i ll keep doing so from now on...i think they are gonna be fine....

Sweet.
Did u get a ph meter?
And were u getting the distilled water ?