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I just replayed it several times, you are right very strange most of the marmalade just takes one strike to break but there is always two that take three strikes to break and they are not in the same place each time also those look blue underneath but they aren't as @Ryanthecrusher said (I tried exploding blue with color bomb and did nothing) and there is no indicator telling you where the three strike ones are! very strange indeed!
Even more strange, I went back to play one more time and without a move the whole board turned into striped candies and it beat itself WTF ?????