Weird result on selecting number of topics for LDA

I've tried to select number of topics for Latent Dirichlet Allocation from my data, but after the processing, the result showed in pict below. What is the correct topics from my data?

I can give you an informed answer with a reproducible example, called a reprex

Just reading the tea leafs suggests that whatever the y axis represents decreases for Arun2010 as the number of topics increase; it increases for CaoJuan2009 with some troubling local minima.

For the lower graph Deveraau2018's sweet spot is 10 and Griffiths2004 65.

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