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Anyway, according to the Wiki page, if you're playing a gunzerker, that kind of thing can happen when you're gunzerking with a Crit.
http://borderlands.wikia.com/wiki/Crit
As for how to get the Swordsplosion back:
If you have a backup of your character save file, you could load your character from the backup, put the Swordsplosion in the Stash, then switch back to your regular chararacter.
If you didn't make your own backup copy, the game creates a backup copy whenever you load a character. There should be a copy of your .sav file with .bak added to the end (eg. Save0001.sav.bak). You could make a copy of your .sav file, to save your current character, then remove the .bak from the copy and load your character and see if they still have the Swordsplosion. If you've loaded that character again after they lost the gun, then the backup copy may not have it either. You won't know for sure until you load the character. After you check that backup copy of the character, you can put the copy of your current .sav file back in place, to restore your current character.
If you don't have a backup copy of the save file that has the gun, you could always do the mission again with another character, or use the Gibbed save file editor to recreate the gun, or get the gun from someone else (check the in-Game Trading sub-forum).