Select component in form.io is showing an extra textbox at the bottom
<p>I am new in form.io. I created a registration page containing textboxes and select controls. This page is embedded into my application. In the preview everything is shown fine,but after embedding in my page,a textbox is shown at the bottom of every select control.</p>

<p><a href="https://i.stack.imgur.com/GzKB5.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GzKB5.jpg" alt="enter image description here"></a></p>