I have had some issues with runoff Ph ..dont quote me but since yr dirt is so fresh it could be the excess mutes being washed out throwing off hr readings ..Just Mop ...i had always been on point but I was ammending with fresh soil at certain times .
For example ..at week 6 I gave 1 cup of a flowering compost I had made ph of dirt was 6.3 ok so I added it ...floowing wash with new dirt ph runoff was 7.6 now I'm like wtf ...
I am No pro but they look quite healthy and they should treat ya well ..
Also I don't think I had ever heard of AK-48 ONLY Ak-47 .
Good luck mate happy growing