so you have a side shoot from a lower node on the plant producing 2-3 bladed leafs.

Did these side shoots ever produce 5 or higher bladed leafs. have they reverted back. or has this never changed.
also, are other growth tips on the plant producing 5+ bladed leafs?

I have found this is caused by stress. Probably Heat stress but also other kinds of stress.

you should give more information about your room.
what kind of light, how far from plant
temps
pH of system

the more you give the better someone will be able to help you