Very strange. Bougainvilleas drop leaves as a response to stress. It could be that your plant dried out or more likely that the roots were kept too soggy wet. It could also be that a significant and sudden change in light intensity from the garden center to your home cause the drop. Maintain moderate soil moisture and take care not to overwater. Then give them some time and they should releaf and in time with good sunlight exposure they should rebloom.
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