No, definitely not - it's that, as plusminusplus pointed out, most of us mistakenly put the stress on the first syllable. That is, we use the same stress pattern as the word 'luncheon', when it ought to be the same stress pattern as the phrase 'lunch on'.

Many incorrectly stress the first syllable, and mispronounce the second

"PIN-chin" is common

I assumed it was pin-chin, but "Thomas Pinecone" is too much fun to not to slip in every once in a while.