Unfortunately all mercury fillings leak small amounts of mercury. Hot beverages and mastication are sufficient to cause small leaks. That's why after many years they need to be replaced.
To say if this is causing health problems to you is a different business. Typically people who suffer from significant toxicity have had many fillings in their mouth for many years. Sometimes they also underwent unprotected replacement, which is a terrible thing to do because the amalgam gets vaporized directly in the mouth.
It's a nasty practice, unfortunately, and there's still not enough awareness of the problem among professionals.