Why would my fudge expand and get soft at room temperature?

Fudge will get soft at room temperature because of the ingredients - butter melts at a very low temperature ( 21-28 degrees C (1)) and that is why it is best to store fudge in a cool place or the refridgerator if you can. As to it expanding, again, its the ingredients although I've never had a fudge 'puff up' when going soft, it normally melts and gets flatter :( but every fudge recipe is different and the climate you experience will change the final consistency of the fudge. If you've added nuts I can see it might fall apart more as it warms up too.

The golden rule is to keep it cool!

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