text copying to every slide

Dear all, I have made a slide with fluid boxes and have set up on some buttons on it.  I have then made copies of my slides as I want them all to look the same.  Now I am finding that if I put a text box on slide 1 it is copying to every other side and I can get rid of them unless I deleat the box on slide 1. dont know why.  I created several projects now and cant see I have done anything different to what I have done before.