Fix Ecommerce Checkout Issue

I have build my ecommerce website and it is fully functional. The checkout page is working fine with woocommerce default page. I have created a my own design checkout page. Whenever I am replacing the my checkout page in woocommerce>settings>archive>checkcout page to my checkout page from default page then the "Place order" button is not working but when I restore the page to the default version it is working smoothly. I need to fix this and this is the only requirement.

I need to fix this by sharing my screen through google meet so I can be aware what changing and how it has been fixed in my website.

Thank you.