Bence is right about that. I would just add that the plant may be growing outwards, having the leaves facing the window growing bigger, maybe finding the light intensity from the window more suitable than what's around the pot area. In the warmth inside the house you may still notice some growth, albeit slowed down. I don't know how warm is the area, but this may cause the plants to retain some growth. I myself have seen few of my Alocasias growing this winter because of outstandingly high temperatures for the season.
One thing does not change, though, the days are shorter and still it's not as warm as in the growth season, so with both short days and lower temperature growth is slow, if any. You can repot it now, but I see no hurry doing so. it was around last fall, that I have cleared a low-growing branch from a Philodendron Bipinnatifidum (Now classified as Thaumatophyllum) in order to make place for my tropical plants under the Philodendron's canopy. The 2" to 3" stem had two aerial roots sticking out. I just took the cutting and placed it in water. I then removed a yellow leaf and exposed one more node from which a root has emerged. I then placed it in a pot (it was around late fall!). The cutting has rooted successfully even with the approach of winter. That thing would work with plants which respond to climate changes/control and are therefore regarded as "opportunistic". You cannot, however, do the same thing with plants which require dormancy as a must, and not "optional".
From my experience, the plants may root and even grow if temperatures are high enough or they are protected from lower temperatures. However, things would have gone more quickly if I waited till spring. They may also respond to daylight duration, not just temperature. I did that in fall because I attempted to root a cutting that I had to remove anyway. It is not, however, a good idea to do it in winter as a routine.