Why the PH are increasing?

Have you calibrated ur ph meter recently?

It's totally normal to have an higher pH and lower EC on the drain side. It is how the plant works.. the high nutrient levels in your substrate is probably a result of constant overdose.. A tip from my side, keep ur focus on a better VPD!

Well when I have this I increase the phosphorus and potassium amount. Phosphorus is a ph down. When nutrition level is right with what plant uses your ph will stabilize. So I would say she has been wanting more feed then you were giving. Now if ph was going low then feed is too strong or a salt build up. This would be addressing the problem, and not they symptoms from it.

Only looks like she is a few weeks away from harvest. I'd be tempted to just water ph6.0 for the remainder of the grow, especially if you have been feeder her a high amount of nutes.

You're going to run into problems with throwing big pH swings at your plant. Or lets say, you're potentially opening the door to problems. I would water in a 5.8 pH water and keep it there till your run off starts to get closer to where you want it. If you want to take a more drastic step you can amend your soil with dolomite lime, which will provide added calcium and magnesium, and will keep your pH around neutral which is better than being way above 7. In the future i would look for a different soil than what you're using. Or if you re-use your soil than give it a good soak for at least 12 hours with pH adjusted water.

It sounds like it could be the soil you're using, at this point with the plant so close to being I would do what you did last time and water her with 5.5 pH tap water until the PH is corrected.