How to reproduce the learn.show_results()?

Hello everybody!
I’m doing a single object detection task and let it run on jetson nano. I finished the training step and don’t know how to decode the output of the trained model. I tried to perform the sigmoid task and multiply it by the original size but the results are different from the learn.show_results. Can anyone give me some suggestion on how to decode that output?
Here is the result from learner

Here is the result from my decoding

Best Regards