New spike turning yellow

[wonderlen3000]

Its normal for cymbidium. Some time, the plant will abort some smaller spike that come out later and focus more energy into the ones that are already developing. If the latter spiking make it through without blasting, they usually don't have as much flower count as the one that pike first.

But you have to keep the temparature constant, during spiking. No drastic change or they tent blast the spike.

[Cym Ladye]

Sorry to disagree with you wonderlen3000, but this is definitely NOT normal in a healthy plant. It can be compared to climbing a steep hill on a bicycle if you bonk 1/2 way up which means your body did not have enough nutrients/fuel to sustain the muscles. In the case of an orchid, the plant is simply not strong enough to hold the latter forming spikes as the first two appear to be green and healthy.