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What brand toilet is this? Does the fill valve come on by itself periodically?
Ok, I'm not familiar with that brand. It's not a common one. If the fill valve doesn't come on by itself then you're not losing water out of the tank when it's standing idle. So I don't know where this noise you're hearing could be coming from except maybe a defect in the toilet. I'm assuming the refill tube attached to the fill valve shuts off once the tank is full. What do you mean by it flushed the bowl twice?
Ok, it's possible you could have a very slow leak out of the tank that doesn't drop the water level enough for the fill valve to turn on before the next flush. Did the chain on the flapper have a little foam float on it?
Now that you mention it I do remember Porcher making porcelain for Waterworks. But they stopped selling fixtures a while ago. As far as I know they only sell faucets and bath fittings now.
And American Standard (who bought out Porcher a while back) just killed the brand in favor of their new luxury brand.
The only time a toilet flushes more than once is when too much water leaves the tank during a flush. This can happen when a standard flapper is used in place of one with the small foam float or if the water level in the tank is too high.
Could be. Porcher's porcelain was made in South America; it had a fancy name but not great quality.