First grow

Is that normal for PH and PPM to go up or does that mean I messed up somewhere ? and how long can I keep nutrients mixed for or will they lock after a certain time ? I made 500 ml mix of Shogun start 0.75ml and katana root 2.5ml on day 2 for feed and have been using that for feeding . Only fed twice this and my schedule will to feed each 4th day ( W,F,W,W, W,F,W,W,W,F repeat ). Think I might make 1 more solution but full dosed as first mix was half recommended. —-Day 1- moistened the coco with bottled water —-Day 2 - -2 baby leafs showing and we got a seedling , -Ppm -281 Water ph before -7.25 -Ph after nutes + ph down to-5.6 Ppm- with nutes 495 -Tent temp with lights off 20.6 Light on 24 —-Day3- watered with shot glass but started getting runoff straight away so left it as is + coco still moist -Removed humidity dome as have 4 leafs now - lights on 18 on 6 off —- Day 4 Couple sprays of water around the coco No much change —-Day 5 — couple sprays of water around coco No drainage —-Day6 Fed plant with nutes . Poured about 50 mill then started getting run off Day 7—- Sprayed some water Can see a root has reached the bottom of the cup and some popping out on the sides run off and ppm is 648 Water at start 281 And water + nutes was 495 Ph run off 6.65 Water ph was 7.25 Nutrients 5.6 ( when feeding with water I didn’t ph down the water.