What causes the target bounding box to be annotated incorrectly?

[HELLORPG]

I encountered something strange while visualizing the dataset. As shown below, seq 012, 0110.jpg:


The text upon the bbox represents the identity and visibility.

The 65 and 38 identities seem to be annotated incorrectly. I think MOTSynth is automatically annotated through some code. I wonder to know what causes this incorrectness.

BTW, I also want to ask about the meaning of visibility in MOT annotation. Is it calculated by the bounding box area or the mask area?

THANKS A LOT.