Some have this problem of high PH, even if your actual values might not be 100% correct. I believe even Kenny showed similar charts previously.
High PH is as undesirable as low PH, mainly due to increased precipitation of CA and decreased stability of traces overall.
If inaccurate probe reading is ruled out, I would look for the reason for the high PH. Given the current weather and possibly low CO2 in your house, I assume your alkalinity is higher than it needs to be. What switch of your two part did you make? What is your alkalinity level?