This is the setting I am using in Adobe Acrobat Reader for the 2x1 files. You need to flip the numbers here otherwise it will put them side by side instead of 1 on top of the other.
Can you let me know how you are printing? It seems to line up correctly for me on both months if I use the above setting.
For Feb, the back of the Feb 1st is the 3rd page (that describes how characters level up). It should line up correctly.