Hi,
There are a number of reasons that can cause it. Check the following:
1. That could be your browse button is too big. While you can customize the browse button's style, you won't really be able to enlarge the browse button. So if your browse button is too wide (for example, 200px), then it will overlap with your input text box.
2. Another situation is when the overall width of the uploader is not enough. If you set the uploader's width to low (for example, 100px), you may see that happens. Uploader needs a minimum width of about 200px.
3. If neither the above is true. Then it could have to do with your page contents. Try follow steps outlined in this post may be able to help you:
http://www.essentialobjects.com/Forum/Default.aspx?g=posts&t=1186Let us know how it goes!
Thanks