I downloaded the portable version and still have the duplicate URLs. Also during instillation when asked if I wanted to import settings from my default browser I said “NO” to everything but plugins were imported from my Mozilla Firefox browser, are they supposed to be imported automatically?
Do you have any clipboard managers installed? Does the issue only reproduce in Dragon or in other browsers as well?
Have you tried using the “Copy” and “Paste” functions from the context menu or the keyboard shortcuts? Also, does the issue reproduce when you use “Cut”?
Does the issue reproduce for other text inside the browser as well ? (text from webpages).
You should also scan your computer with some security software as it is never a bad idea.
The issue does not occur with any other browsers, I tried it with Firefox, Internet Explorer, and IceDragon. The issue does occur when I use cut and paste.
The issue does not reproduce with text from the webpage.
I scanned with ESET online scanner, nothing found.