Mini Daffodil

The previous guests reported two light bulbs not working.  So before the next guests arrive on Thursday we popped out and fitted replacements.  The first thing I noticed on getting out of the car was the open mini Daffodils.  On Saturday they were just yellow buds.  I am puzzled by them, I am used to daffs multiplying as the years go by and forming a clump reasonably quickly.  These have been in almost 20 years and they don't seem to have multiplied.