Royal Icing - Some Drying, Others Not

Hello, fellow cookie peeps! 

I'm having a little trouble with my royal icing. Colored icing is drying hard on some cookies and, on other cookies, it's not close to being dry even after ~7hrs. They are from the same batch, and the icing was not colored on the cookies that didn't dry. 

The icing recipe I use is sifted powdered sugar, cream of tartar, vanilla extract, and egg whites.

Any info is appreciated! It's just becoming frustrating when I have an order due and my icing is not drying. :/

Thank you!

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