Edo there was a new update after the last one because the widget showed every flag possible.
3.0.2
Fix for multiple appearance of the language selector in menus for some themes which call the render menu more than once
This is still happening with oxygen builder! I can’t see my top menu because all the flags covering the editor. This is not happening on the main website outside of the editor!
Looks like I will not be able to experience the issue myself and Oxygen Builder seems to be a commercial product.
If the issue does not happen on the front-end, when everything is configured, then consult Oxygen Builder support, so they can identify the cause. Most likely our gtranslateSettings variable in javascript is not invoked and it defaults to showing all flags (default setting when it is missing).
If the issue happens on the front-end, then please post your website address, so I can see the issue myself to identify the cause.