Our oranges do not seem to grow as big as the last few years. They are sweet like in the past but remain a little green on top part of orange. We water 2 times a week same as in the past. Also fertilize the first of every month when we are here. We are here December thru mid April .
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This can happen over time. It would also help to add a little sulfur in the form of iron sulfate, as well as a little extra potassium and phosphorus, as sometimes they will need a little boost for fruiting.
Depending on where you are located, Much of the eastern U.S. has been a little cooler this year, which has affected many citrus crops.
This article will give you more information: https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm