Cooldown Reduction Calculation Bug?

I’m running a Lightning Spear Sorc build and noticed that the total calculations for cooldown reduction are inaccurate. For example I have 39% on Harlequin Crest and 21% on Tal Rasha’s and that’s being totaled as 50% instead of 60%. When I take off either item I see the correct total in the profile but together they are somehow being capped when it says the overall cap is 75%. can someone look into this?