Just installed a new RO system

[ALToronto]

And the pH is 8.5. Unfiltered water pH Is 7.3, and when I was using a jug water filter (ion exchange), filtered water was clocking in at 6.7.

I checked my pH meter with store bought distilled water - 7.0 on the dot. What gives with the RO? The 8.5 reading was after the initial tank flush, and the TDS reading was 12 ppm (down from 136 for cold tap water)