Can you please try clearing out your cache and cookies using the guide below?
http://en.support.wordpress.com/browser-issues/#clear-your-cache-and-cookies
Also, please make sure your browser is updated to the most recent version:
Then, finally try testing on browsers like Google Chrome and Firefox.
Also can you check if copying works in Text Mode or not ?
Update : May be there is some plugin thats causing the issue. Try disabling all the plugin at once. And enable them one by one to detect the plugin that’s causing the issue.
Update : Change your theme to WordPress default Twenty Seventeen theme and check if it solves your problem. If it does then there is some problem with the theme.
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