Object detection only recognizing 1 object instead of multiple obects despite me using bboxes?

Basically this is my problem in figure 3: https://gyazo.com/fbff416c5765c953a52e00067b5b70f9

It only does object detection for 1 surgical tool instead of multiple despite me using bboxes (the plural/multiple object variant). I'm not sure if there is more for me to edit in order to detect and label multiple surgical tools..

Variables/Workspace: https://gyazo.com/7b19e023af96ad7dc1fd547c487793d7

Any insight would be much appreciated

Full code for reference: https://pastebin.com/CiLYqNRm