Appian AI Copilot Interface generation using pdf

So i was trying to use the appian ai copilot feature for generating interface from PDFs. The first time i gave it a form, it ran successfully and generating the interface competely. The next time I gave it the same form for a different interface, it did generate only 1 field and the submit button. First I thought it was the issue related to pdf, but then the same issue happened, with another pdf. It seems like when we give it the pdf for the first time, it works well, but when we give the same pdf for another time, it does not generate. Can someone explain this issue.
This is the interface it generated, when i gave it the interface for the first time :- 

This is the interface it generate when i gave the same pdf the next time :- 

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