Hello Dajinn,
Sorry to hear about the issue. Unfortunately our Vengeance RGB Pro memory isn't supported on the X99 platform as it isn't listed under the compatibility list on Vengeance RGB Pro kit product pages.
I'm not sure what causes it, but I have seen it before, specifically on the X99 platform, where having BLCK at anything other than 100 can cause detection issues. Some X99 boards require being on a BETA bios to detect at all.
Unfortunately with it not being a supported platform, I can't guarantee anything but I will pass it along.
https://www.corsair.com/us/en/Categories/Products/Memory/Vengeance-PRO-RGB-Black/p/CMW16GX4M2A2666C16