Technical problems: feed craziness

Bear with me. I don't know why Blogger keeps re-posting my articles on the feed every time I make an edit. I was told by the webmaster of one aggregate - Progressive Bloggers - that an article would be re-posted on the feed only if the title or date of the article was changed - I did neither, and still the feed re-posts every time I edit. Would someone who is not totally new to blogging, blog groups and feeds, who is not technologically challenged like myself, please let me know how to edit posts without having this happen? It's damn embarrassing and frustrating, and I'm sure its quite irritating for others as well. My apologies.