How solve timber structure in Karamba3D

I would like to analyze the following model in karamba3D, but it appears that large deformations are occurring and perhaps something is wrong.

スクリーンショット 2023-10-27 193217

I would like to know the reaction force and deformation when three pieces of wood (1818300) are attached to each other with instant glue and subjected to their own weight. I used a short line to treat the joints between the trees, but I don’t know if that is correct.
timber (31.1 KB)