Why does my JavaScript site look fine to users but not to AI crawlers?

https://wiki-site.win/index.php/Is_Performance_Max_Worth_It_for_Multi-Market_Ecommerce%3F_A_Technical_Reality_Check

In 2024, I spent my morning reviewing a folder named 04-12-24, filled with screenshots where LLMs confidently stated our client did not offer shipping to California when their checkout page explicitly mentioned it