Not showing Danish ??? right when sharing fro explorer

Hello.

Just Tried Hithlighter.. it seems awesome…
And works fine with chrome. But when i went to try it out in explorer and shared to facebook it showed questionmarks al the places with ? ? and ? (Danish letters)
When sharing to twitter, it worked perfectly both in chrome and explorer.

Is this a bug in the plugin or in my explorer?
You can see the quote i shared here
It was the PS. in the buttom of the blogpost.

thanks in advance
Mette

https://www.ads-software.com/plugins/sumome/