Your info appears correct- Twitter could use different severs for the "Tweet This" button then they do their regular site so it's possible one is over capacity while the other still works- in fact I'm fairly sure different sites tweet buttons get handled by different servers- I would give it a few hours and try again before worrying too much.
If you want me to take a look you can post your exact twitter code used in the template here and I'll double check it for anything suspicious.
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