High light causes plants to grow shorter and sturdier, which is often a desirable characteristic, but there are some cases where it might not be. Apparently high light can cause the flower spikes of Paphs not to get tall enough and the flowers are held too close to the plant. High light can also cause Phalaenopsis spikes to grow with shorter internodes, which can result in the flowers being crowded on the spike.
These are all things which I think I remember reading, but I can't tell you whether this information is accurate or reliable, but since nobody else has offered any thoughts, I thought I'd throw this out there.
I don't grow peace lilies (my grandma always had them, so I know what they are, but that's about it), but it is my understanding that they like shade. It doesn't seem like an east window would be too bright for anything at all, but is it possible they are getting too much sun?
Have you considered whether the temperature is appropriate? I think these plants like warm temperatures, and maybe if they are too cold, that could have an adverse effect on their growth habits.
Or maybe it is just adjusting to different conditions, and the next round of flowers will be better.
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