If you have more than one deposit, check to see exactly which one you are searching with and when it expires. It's possible you are accidentally searching with a deposit that expires in December.
It is possible you have a trade power issue, but it would be odd to be missing only the January weeks. January is not a particularly high-demand time for Orlando. Look carefully to see what else might be missing from your list.
Your best bet would be to place an ongoing search for the property over a range of dates that could work for you, and see what happens. If you get inside of six months prior to check in and haven't had a match, it will be time to add more resorts to your list.