Hi,
I can see that the debug is still activated on your website:
i.imgur.com/JxpggA4.jpeg
As you can see at the bottom of your pages, you have the debug area displayed.
Ideally, the developer of the plugin can provide a fix for the warnings, but you need to turn off the debug if you're not using it for an issue. It gives information that hackers could use to more easily hack your website, and it forces the display of the warning messages.
I've never seen a case where the debug area at the bottom of the pages would display with the debug setting of the Joomla configuration turned off. Please double check.