From an old thread:
[Data]There is a theory in quantum mechanics. Each time a situation has more than one outcome, each of theese outcomes will happen in different quantum realities.[/Data]
A little quote from the TNG episode "Parallels". I'm not one to argue with Data about quantum mechanics, so I'll accpet this as a valid explanation to this oddity. The rift wasn't a time rift, it was a rift into another quantum reality. The quantum reality that would have happened if Fry fell into the freezer-doddle and went to the future-jiggy.
Problem solved, no need for a wizard.
Anthology Of Interest I errors