Including the OP's code snippet in a working example results in two frames with the same title (if one uncomments the second
\frametitle). The first frame contains two slides (a list with one item which is uncovered on the second slide), the second frame contains a graphics. As there are two frames, there are two "dot" entries in the header (assuming, e.g., the
miniframes outer theme).
I guess the OP wants one frame with three slides, and the list to be replaced with the graphics on the third slide. This can be achieved using the
overprint environment and the
\item<2> example 1 say