This is actually considered a 3 category upgrade since you went from a 1C to a 1F.
As I mentioned earlier, this type of upgrade is not uncommon when booking guarantee cabins - i.e. inside to inside.
However, I would be interested to hear how you like being under the Great Outdoors. Normally, I do not like booking anyone in these cabins because often, this can be a noisy area and you hear people walking, dropping things, and dragging tables and chairs.
Might want to contact your travel agent and see if there's anything else available as I would hate for you not to thoroughly enjoy your cruise.