[SOLVED] Merged posts in "Categories" and "Archives"

Hi everyone, glad to be onboard!

I'm working with the Atahualpa theme, and I've just created a website which is not yet ready to launch. I've posted only one post. While I was experimenting, I had entered a second post, with text "Just testing bla bla bla". I then deleted that second post. So when I go to my home page, I only see my first post.

Here's where the problem begins.

When I go to the Categories section (specifically Uncategorized, where my first post is) or Archives, the post starts with the phrase "Just testing bla bla bla" and continues with the text of my first post! It has merged the two posts into one (the deleted one and the current one)!

So I go with firebug to the phrase " Just testing bla bla bla". I want to edit the html, so as to get rid of the text. Of course firebug does not save the changes. When I point to any part of my webpage with firebug, HOW DO I KNOW TO WHICH WEBSERVER FILE IT CORRESPONDS TO so I can make the changes? I know that HTML is created dynamically, so there are no html files in the "ahatualpa" folder in my webhosting folders so I can immediately correct it, but there must be a way to get rid of that pestering text!

Any help is more then welcome,
Best,
Peter