I'd previously commented (a couple of months ago?) about the US pronunciation "innernational", "innernet", and "inneresting". Again in your examples it's the -nt- combination that just turns into -nn-. I'm telling you, I even catch myself sometimes saying things like "paining" instead of "painting". Then I get angry for being so easily influenced by the overbearing foreign media presence in our country!

...Then again, our friends across the pond rhyme "horse" and "sauce". So who's to judge?