Have a look at how many trophies that they had compared to you when you revenged them if they had dropped trophies and were now much lower than you they will only be worth a small amount of trophies to you even as little as 0.
This works in the opposite direction as well if you revenge a person who has gained a lot of trophies since they attacked you they can be worth up to 59 trophies for a 3 star win
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