Based on the information you give I get the feeling you are 'over watering'

Plus you do not state where it is located.

It might be suffering from a physiological problem i.e prior to purchase it may not have been looked after properly and now that it has been moved to a new environment it is sulking/rebelling!

It needs time to settle into its new environment have a look at the info here;

http://www.thegardenersalmanac.co.uk/Data/Fuchsia/Fuchsia.htm

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