Just synched and edited the translation for the theme via the Loco plugin, so the situation with the Off-canvas cart content is independent of it.
Please try to disable all the third-party plugins (including cache plugins), that does not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear the cache of the browser, and check then. Maybe one of the additional plugins is the reason for the problem.
Check if the problem isn’t caused by your changes in the Child theme.
Regards