Text elements shows on wrong slides

I have a presentation with 3 slides. Different text elements on each slide. When I run the presentation in the viewer the following happens:

1. On slide1, text elements from slide1, slide2 and slide3 are visible.
2. On slide2, text elements from slide2 and slide3 are visible.
3. On slide3, text elements from slide1 and slide3 are visible.