Photoshop issues

[biancka]

I am having the worst time scrapping at this moment. When I am scrapping and I have an element selected, it just disappears on me and I find that it has moved to the middle or just a little bit but it is not on the same spot I left it when I clicked to add the shadow or moved my mouse to select another style. This is really annoying because something I don't even notice and then I'm 25 steps further into my layout and then I see something is missing. This happens so often and I have no idea how to fix it. Anyone else have this happening ???