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Hmm, what Candy Crush version do you have? You may have too old version which has some levels too hard. I am using this version downloaded from that page http://apkplaygame.com/puzzle/candy-crush-saga/ and everything seems to work fine, all levels are normally hard.
First of all make sure to synchronise your progress with Facebook, then uninstall Candy Crush, then download the apk file above and install it. Then check if level is still harder than it should be