I fairly new to all this
Hives generally have drones for two reasons. First, they are fully developed broodnests from late in spring through the summer, or much later in the year, they may be into supercedure. Either of those is for potential mating purposes. Normally, drones will have been ejected some weeks ago. The second is queen problems, as in DLQ or Q-.
Sometimes drones can be retained all through the winter, but not often.But retained, not re-appeared as fresh brood.
So yes, they could have been fooled by the late unseasonal start to this last month. However, that would not stop the alarm bells ringing. Likely little to do about it now, but one thing it is certainly not - and that is 'normal'.
RAB