Simulating multiple marginal effects

Hi again. I just want a confirmation if I understand the model correctly. My goal is to simulate 10 disease SNPs, 2 of them having epistatic interactions, the rest having only marginal effects. I have specified the model like this:

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However, in my output under disease SNPs, it only shows 3 snps. I would expect the dataset to contain 10 disease SNPs, the first two having epistatic effect and the rest having only marginal effects. Is this a faulty assumption?