You are from Canada right? You bought this plant in April when it was still relatively cool. Now it is warming up a bit...? Fuschias originate from southern Chile. The climate there is very different to central Canada. Summers are cooler and winters very much milder ( usually frost free). Try and keep your plant as cool as possible during the hot summer months and free of frost during winter. Another problem could be that it has used up its fertilizer. Try repotting into a rich organic compost and when iit is well-established feed with a liquid fertilizer once a fortnight. Hope this helps.

Too much sunlight exposure will make your plant weak and the flowers will not develop properly. Make sure there is an adequate shade to cover your fuschia plant.