Topic duplicated

Hi, your plugin is very useful, I have a problem I get the translated topics duplicated.
I’m checked the problem with the last version of the plugin and with the dev version too.

Do you have any idea how to fix it?

You can check the problem here: http://testp3p.panzaepresenza.com/

The topics in Italian which is my second language are duplicated.

Thanks,
mikev78

https://wordpress.org/plugins/ceceppa-multilingua/