My buddy club exhaust did the same thing. Check to make sure you didn't tighten one of the bolts (that connects it to the front pipe) too tight on one side. If they're both even the only way to fix it would be to cut a hanger off, put the exhaust where you want it to sit and weld in another hanger (and make sure there's a bit of pressure on it).
Edit: any exhaust shop will be able to do this for you for relatively cheap (don't pay more than like $40 for it MAX)
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