X two big peaks

Hi all, I have trouble finding the issue with my X axis. Y graph looks fine, but on the X graph, there are 2 big peaks at 65Hz and 130Hz.
My V-core 500 is placed on a table, but is rigidly mounted to the wall. Any help appreciated
belt-tension-resonances-2023-05-16-104932.png
resonances_x_2023-05-16-120013.png
resonances_y_2023-05-16-120025.png
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