I have 8 ixora small new plants the leaves are falling off of them but the plant looks green. Just planted them about 3 weeks ago. The leaves are lying on the ground next to the plant and are not eaten.
Much of the US is experiencing a cold snap, and cooler temperatures. If this is likely the issue in your area, then they will recover soon. If this is not the case, then I would look to a pH issue in the soil. They prefer slightly acidic soil, and would enjoy a little iron sulfate to help with that. Here is an article for more information on the care of these: https://www.gardeningknowhow.com/ornamental/shrubs/ixora/growing-ixora-shrubs.htm