Posts not updating via wp all import?

Question

WordPress

I use the wp all import plugin, the problem is that the update file contains exactly 50 posts, i.e. if 3 posts were added to XML, then 50 posts will also remain, only that the last 3 in the list will be deleted.
and when I import that, instead of replacing/updating the existing post, another post is added.
I tried many parameters, zero sense, what should I do?