Here is a good handbook that may help in finding out what the issue could be.
I can't be positive, but it looks like aphid to me. They can be really hard to see sometimes because they are small and the same color as your hops. They like to hang out on new tender growth. Then when they suck on it it grows all deformed, very similar to what your condition looks like. Did the leaves just recently acquire the leaf curl? Or have they had it for some time now?
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