You should start your own post…
The plugin is supposed to work with 5 digit zip codes, and by using the csv from taxrates.com. It’s not my problem if you are downloading some other csv files and trying to import them using this plugin.
No where does it say to import random csv files… It specifically says to download the csv file from taxrates.com and simply import it.
The problem you are having would be related to woocommerce so talk to them about it. All this plugin does is import tax rates based on zip codes from a csv file. Which the default is 5 digits… so if you are using a custom plugin to calculate shipping using 9 digit codes you are importing, then woocommerce needs to make a fix so that 9 digit zip codes are being calculated, or you need to modify the csv to have the same format columns as the taxrates.com csv as I am assuming you are importing some other random csv files that are not importing correctly because of the wrong format.