The code change seems to fix the problem. Thx!
I was experiencing this problem with WPML and The Events Calendar (admin toolbar in frontend appeared in 2 languages). I just updated a file as outlined in the issue linked above and the problem seems to be fixed. Hopefully this will be fixed by the plugin in an official update soon.
Thank you for the reply. Because I am working as a volunteer, I don’t know the ins & outs of the site and am currently trying to gather information so i can submit a ticket with themeforest/envato.