Home Page Slider adding duplicate slide

Hello!
I just added a new post to my slider with the original category falling into an existing category (numbered 15) that I had already included in my slider. When the new post appeared on the slider, it caused the next page, whether it be from category 6, 4, 3, to be duplicated. So I created a new category for this new post, numbered 798, and it is still doing the same thing. I take out each category of the slider, add one by one, everything is appearing once just fine, then I add this post with category 798 and it duplicates whatever comes next after it, just as it had when I put it in a category that was already working fine on the slider. Not sure what I may have done when I created the post itself. So for each category, there is only one corresponding post: 3,4,6,15,798 Only five slides should appear, however six are appearing as whatever the very first category is, it will duplicate. No matter what order I put 798, what order I put the other categories to appear, or even if I change the category of the post, it still does this.
Thanks so much!
Jamie

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