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well - in my experience it is because the solder is not fully melted. With something like an AC jack, there are lots of places for the heat to dissapate and therefor not fully melt. It is a delicate balance since too much heat can damage "downstream" components and too little will make it so the solder won't fully melt.
More heat is the general message and good luck.
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All truth passes through three stages:
First it is ridiculed
Second, it is violently opposed and
Third, it is accepted as self-evident.
ARTHUR SCHOPENHAUER (1788-1860)
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