Calamondin Orange Tree

Question

I moved my tree indoors several weeks ago due to cold temperatures. But since I did that the leaves have been steadily falling off, and recently the fruit has started falling off as well before they ripen.

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Answer 1

You most likely have a branch growing from the root stock.
The Calamondin is grafted onto the hardy root stock of a citrus, which may be a sour orange variety.
Suckers that grow from the root stock should be pruned away as soon as they appear.

https://www.gardeningknowhow.com/edible/fruits/calamondins/growing-calamondin-trees.htm