Some orchids in response to poor environment they begin to produce more keikies especially to the older pseudobulb eg dendrobium crumenatum, in other condition when too much fertilizer given to them especially growing type (NPK 20:20:20) again will be manifested by more keiki. When the root system rots again the same reaction will follow. Your the pseudobulb is OK maybe need to check the root.
Another possible causes is to give you more plants later you can repot it.