I don't know. It could be humidity or root issues. I would start by checking the roots, and then increasing humidity and increase ventilation as I increase humidity (don't want to rot the roots). Masdies are tricky that way.
Also did you check for mites? Mites can lead to leaf shape changes too.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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