Name: Daisy I Reno, Nv (Zone 6b) Not all who wander are lost
Welcome to ATP.
There is no such thing as a crazy question. I think the 4th cutting didn't have enough oxygen. Without competition, it had all the oxygen it needed. Sometimes, when rooting cuttings in water, it helps to add a drop or two of hydrogen peroxide to help oxygenate the water.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost
President: Orchid Society of Northern Nevada
Webmaster: osnnv.org
