That pH sounds too high for that level of KH. There is something in the water doing this.
Here are a few links to info about RO and the pH and KH of the water before and after treatment. (not aquarium related sites)
http://www.freedrinkingwater.com/water-education2/ro-ph.htm
http://www.puretap.com/ph.htm
They indicate the pH should be lower, not higher after treatment. But they also show that even a very small amount of something added to the water can make a big difference in the pH of the water.
Here are a few links to info about RO and the pH and KH of the water before and after treatment. (not aquarium related sites)
http://www.freedrinkingwater.com/water-education2/ro-ph.htm
http://www.puretap.com/ph.htm
They indicate the pH should be lower, not higher after treatment. But they also show that even a very small amount of something added to the water can make a big difference in the pH of the water.