Help with TinyYoloHouseNumberDetection example

Hello, I used the example from github TinyYoloHouseNumberDetection to train a model and then I used it with the test data to identify the numbers from houses and their location but didn’t get the expected result. This is an example of what it got printed and also an example of one of the multiple output pictures:

The nans would explain it. How did you tune your model?

I used the example from github, didnt change anything