Are the same node paths a problem?
You either need to make your aliases not language specific (you can only do that in the alias administration page right now, not in the node edit form) or you need to create one for each language.

If the alias shows up for all languages, make sure you made the path field translatable in the content translation settings, maybe something doesn't work correctly otherwise.

See https://www.drupal.org/node/2775275 for an issue to allow language-unspecific aliases. You could also use tokens to get the original language with pathauto to work around it.