Please send me your store url so i can check with your store because this problem is not of debut theme.
Yes, send me Store url here or on my mail. So i can check
an you send me store front password here or on my mail, its password protected.
I think i can see Add to cart button on this product,
please check and let me know.
If helpful then please like and accept solution so i can help other.
Here no any solution need so he can complete and close this topic. and if still not show then he can explain here..