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We have bottled Muscat wine and with a few bottles (three out of 30) the cork seems to be pushing out.
The storage area is 12 Celsius. The wine was bottled in mid June of this year, by a small winery. This is a very recent event. All the other bottle tops are still that tiny bit concave.
What can be going on ?
This is generally an indication that the wine is not stable - that is, it is still fermenting, which is a defect in wines not intended to be sparkling (carbonated) wines.
If you made the wine, and the winery bottled it, this is your problem. If the winery made and bottled the wine, I would bring it up with them, as it's their problem, and hopefully they will replace the bulging bottles.
In making wines one either has to aim for a dry wine where all the sugars have been consumed and there is nothing more for the yeast to eat, or one "stabilizes" the wine by either filtering out all the yeast or chemically "stunning" them to prevent further fermentation when bottled. Whatever method was supposed to be applied to your wine was evidently not done properly or completely, and now fermentation is continuing in the bottles and causing gas pressure, which is pushing the corks out.
If you can't get the winery to replace the bulging bottles of wine, your best bet is to refrigerate it as cold as possible without freezing it, and drink as soon as possible.
If you did not bottle yourself, and I don't think you did, Homebrewing may not be able to help a lot other than to give multiple ideas of what is happening. In truth, either @Encerwal is correct and it is still fermenting, or worse, it is simply going bad from contamination and not high enough alcohol content to stop the pathogens are the two things that quickly come to mind for me.
In either case, I would try to contact the winery. If the bottles have not been exposed to high temperatures, this should not be happening. If the wine was intended to be sparkling, it should be bottled with correct higher strength bottles and the correct, wired in corks to handle the added pressure. Even it the wine is still good, not a pathogen issue, you are in danger of pressure bursts, and a major mess on your hands.
