This is a very common mistake made by newcomers to rod building. Rod guide sets never include the tip tip. The reason for this is that the tips of rod blanks vary a lot from one rod maker or rod model to another. The guides, from stripping guides to running (snake) guides are of a pretty much standardized size progression for a given line wt rod; however, the same cannot be said of tip tops. I know of no rod building supplier who includes tips with guide sets.
And Cabela's catalog clearly states that guide sets do not include tip top, even though the tops are pictured with the guide sets.