Computers? Microsoft or Wordpress?

I have absolutely no idea why on some computer and/or some of my blogs there are random lines of gibber jabber before my actual blog starts. I can see it sometimes and I delete it, but then I get on a computer somewhere else, and there it is… very strange. I believe it is because I type my blogs in Microsoft Word first, then paste them here; but I am unaware of how to get ride on that line if I cannot always see it. Let me know if you have any advice. Other than typing up my blogs here. (I don’t always have internet and who would capitalize all my I’s?? :)