PH in runoff

I am growing in buffered coco coir. My plants are in the fourth week of veg.

I am watering every three days each plant gets about a liter a day.

I have divided the nutrients in to two portions for the week.

I am using RO water and Remo nutrients.

PH mixed with nutrients going in is 5.5

The runoff is 7.3.

Does this seem high? Or does it matter that much.