Stopped the language link to home page working

I installed your plugin. it didn’t work on my site. however it did stop the other language home page from showing. I use WPML (hence the choice of your plugin).
When i have language URL format set as: different languages in directories, this suddenly stopped working. even after i deactivated the plugin and deleted all the files, this problem persists.

My question is- do you know if your plugin writes to any files or changes them in any way, as to cause such a problem.

any help is appreciated
many thanks.

https://wordpress.org/plugins/easy-wp-cookie-popup/