Some daylilies do have "runners" and they are not often welcome in the garden because they tend to spread into the neighbor daylily clumps. If you dropped some seeds that of course could be where the new daylily fans are from. There are also a few daylilies that have a tendency to multiply pretty fast. That is normally considered a good thing.
I think as long as the little new growth daylilies are not the result of "runners" the new plants will be a welcome addition.
