I don't know English very well, so I use Google translator to communicate on the forum. However, when I copy the text from there and paste in here, it looks like this.
What could be the reason for this, and how can this be avoided?
I can't replicate this behaviour on my machine, but it's likely that you're copying whatever formatting gtranslate (wrongfully) adds to its output. I would try pasting with Ctrl+Shift+V.