Hi!
Of course. In some cases if the search bar is placed to appear on a javascript event (like in your case) the width is not triggered to calculate correctly.
The best and simplest fix is to force a min-width CSS attribute for the input fields:
[code]
.proinput input {
min-width: 350px;
}
[/code]
You can add this code to the Custom CSS field, which you can find on the Theme Options->Custom CSS panel on the search options page.