PH high since adding fuge

[wetone]

My PH was always at a stable 8.2. Two weeks ago I added a refugium and the caulerpa is growing great. I have the fuge lights on for 12 hrs opposit the main tank. The PH is around 8.36 during the end of the main tank lighting period. The tank is at 8.58 this morning about 10 hrs after main lights go off and fuge lights come on.
I also have been adding Kent turbo calc daily to bring my CA up. It was around 330, now up to 400.
All corals and fish seem happy
What could be causing this?....should I be concerned?...how do I lower it?

 

[wetone]

DKH = 10.1
ALK = 3.71
SG = 10.23
CA = 375-400 (having trouble moving this up !!)
NO3 = 0
PO4 = 0 (although still battling small algae problem, hopefully the fuge will be final step to eliminate this)

 

[wetone]

My PH looks like 8.3 with my Salifert kit, but my PH monitor is the one that moves from 8.3-8.6....I guess I should get some calibration fluid to confirm.
But I'm still wondering if there is a big concern if it is high???

 

[wamp]

Yep, you need to calibarte the monitor. Mine was jumping too and it was just that it needed to be calibrated.