40GB RAM Installed but only recognizes 24GB (SOLVED)

[nexusbills]

I recently recieved two 16GB RAM sticks in the mail and so I installed them into my computer. The two 16GB sticks take up the first and second RAM slots, and I also have two 4GB RAM sticks which take up the third and fourth RAM slots. When I started up the computer I checked the properties (I have windows 8.1) and it says I have 24GB installed and 22.9GB usable. Before I purchased the RAM I used crucial.com to determine the maximum amount of RAM I have available, which is 64GB. Any help is very much appreciated!

SOLVED: There was an error in my order im dumb

 

[Tradesman1]

Was it the 16GB sticks were actually a package of 16 (2x8GB)? Also if it's a 4 slot mobo from CPU you probably want the sticks going 8GB - 4GB - 8GB - 4GB rather than 8-8--4-4