Bounding box not working

my bounding box isnt giving me a bounding box, but some stretched anomaly…super weird bounding (551.5 KB)
it only has error on these parts, the rest of my pieces are ok

check this what you need. Try union box in bounding box option. @aeaechan96

i tried that, but what i wanted was actually perfect bounding boxes around my indiv pieces. rebuilding geoms in rhino seems to have worked.