Hmmm, well, its a case of just because you can does not always mean you SHOULD. Allowing your plants to mature before propagating them is really the best thing you can do. Crystallinum eventually get leaves that can be 15-18" long, and when the offsets are larger they will do better than very small offsets. It may just be sulking. Some plants do not like to be disturbed that way. My Anthurium papillilaminums hate to be propagated and can sulk for a month sometimes.
The proper way to propagate an anthurium offset is to unpot the entire plant and separate the two plants by separating the root system manually, not by slicing it off. Both the root system of the mother and the onset are then preserved. You may have damaged the root system of the 'floppy' one and it may be showing its unhappiness
