Look at your machine settings "gantry height". You don't want those rooks to touch the cross bars. But if you place them far enough apart at a diagonal you can have it ignore the gantry height settings by setting it to 200mm. Or maybe it's a feature? Have the gantry knock one of the rooks over when it starts printing the second rook?
I think they are too tall. Or at least that is what I noticed when I have this issue. As a test try laying them on their sides or use a smaller part to see if it kicks in.
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