kubiq

When someone has CSV with correct headers like : post_title, post_content, post_excerpt, post_date, post_name, post_tag, post_category, post_author, featured_image, post_parent, post_status, product_type, product_cat, product_tag, product_shipping_class, shop_order_status

…than it will automatically select it from drop-downs in second step

For me it’s working fine ??

Or just try to turn off (deactviate) all plugins you don’t need.
And UPDATE every old version.
After that, in my case, I removed just one jQuery library in plugins directory…
It’s not the best solution, but it worked to me and I didn’t have to search something in source code of plugins

Yop, there were too many plugins activated, and many of them were loading their own jQuery library, so there were several collisions… you have to load the jQuery just once (the main library like jquery, jquery-1.4.4, etc. just ONCE, others like jquery.cookies, jquery.easing etc. are not problem)