That is the extra code that Microsoft Word adds to your text for formatting when you use it. When you cut and paste directly from Word the codes come with it. In a previous version of this site we had a button that would clean out the extra Word codes, but it's not available in this version.
I would suggest trying to save your word file as TEXT only and then try to copy it.
You could also try to use WordPad or Notebook instead of MS Word.
If you're using Word for it's spell checker, just look around, there are HUNDREDS of options for spell checking now-a-days.

Avatar by me.