WC with WP All Import

WordPress 4.0
Woocommerce 2.2.7
WP All Import Pro 3.4.2
WP All Import Woocommerce Add On 1.3.5

I have two WordPress sites, one of them I created in Chinese and then cloned it into a new site and used WP All Import to update all the content to English. My problem is that the sizes can’t be updated.
In the Chinese site, my sizes were S, M, L, XL but in the English site I have S, M, L, XL, 2X, 3X and maybe 6 other sizes.
WP All Import told me that I cannot add new sizes using their plugin, so I tried other ones like bulk editing manager, that didn’t work either.
I decided to just clear all my WC products and start new. Since I only have about 60 items and I have the csv to upload it’s not a big deal.
But no matter how many times I upload the file, nothing happens!
Zero items created, zero items updated.
I created a demo site and uploaded the items using the same csv, and it worked fine. So I came back to my site and deleted WC completely, did a reinstall, and then tried the upload again. Still, nothing happened.
Is there something I can do to save my site? Or am I really just doomed and have to work on the demo site from scratch and then move it over?
Btw, I have no knowledge of php or coding or…any of that stuff. Please bare with me as I can be a bit slow. I tried to provide all the information I can think of, if there’s anything else you need, please let me know. Any help that I can get would be greatly appreciated!

https://ww.wp.xz.cn/plugins/woocommerce/