Hi!
My best guess is adding a min-width attribute to the input field. This issue is known for some cases, the upcoming update will have a different approach so this should not appear again.
In the meantime, I suggest the following CSS code:
[code]
input.orig {
min-width: 200px !important;
}
[/code]
“200px” usually works, but you might have to change that to a lower/higher value. You can add this custom CSS code to the Ajax Search Pro plugins Theme Options -> Custom CSS panel.