"Tripple" comes from the fact that almost all "consonant-l-e" words with a short vowel sound in the first syllable have two consonants before the l-e, so that the first syllable is a "closed" (short sound) syllable, and the second syllable is a consonant and l and e. THe person spelling triple with two p's has an astute intuition for spelling but hasn't learned the exceptions. SInce spelling is scarcely taught thoroughly anymore (or else you, too, would know why this word was tricky) it's no surprise that people would make this mistake.
Consider: supple (though I have a friend who pronounces that souple!), grapple, pimple, and in the long-vowel world noble, able, and bugle. (Long vowel sound c-l-e words are much less common, too.)
And people say you never use this knowledge!!![]()
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) it's no surprise that people would make this mistake.

