Pronunciation of “sufficient”

Question

Recently, while watching Walking Dead, I heard "sufficient" pronounced differently from what I have learned twice. I learned it with a "sh" but they pronounced it like the original "suffice". Checking multiple online dictionaries indicate the way I've learned it is correct. Where does the different pronunciation come from? Is it a dialect?

EDIT

After trying to find the part again I can't say for sure anymore that it was Walking Dead (see comments). But I definitely heard it twice in something I watched recently and as far as I remember I only watched US productions.

Answer 1

Likely just an accent, American English can deviate substantially from English, see potayto and potarto.

In English, the "sh" is common, I pronounce it suff-ish-ent

Answer 2

I pronounce it as "suffi-shi-ent"; 'shi' as in ship.