Why change bbox subtle will lead the text generation worse?

[5RJ]

Hello, thanks for your work to push this area. However, I can not reimplement your inference result, like shower.json in examples/
The json is in applement files.
shower_ori.json

I got the result as follows:

And I also find that when get the bbox smaller or larger, the generated texts gonna be uncontrolble, I'm curious about the reason:
this is the result of get bbox width smaller: the json is
shower_small.json

this is the result of get bbox width larger: the json is
shower_large.json