Changing Order Details Does Not Remove Free Ship

Hello! Great plugin, just what I needed! But I did find an issue. I have it set so if someone buys 4 items they get free shipping. It works like a charm when you add 4 items but if you reduce the quantity down to 1, then the free shipping doesn’t get removed. It seems to only occur in Google Chrome b/c I just retested in Firefox and Safarai and it’s fine.
Any idea how to fix this?

Here’s my site in staging – https://ef5.b49.myftpupload.com/product/buy-bunionette-bootie/

https://www.ads-software.com/plugins/woocommerce-advanced-free-shipping/