Field issue

Hi Guys,
I need support with my Login form.
I don`t get to insert any character into username field. Just in password field.
The height of page is not enough to form. It seems overlapping fields.
I already have installed others members plugins and never get the same issue.(height of page)
Could you help me to fix it?
How can I upload a image to show it?
My website is offline to public yet.
Thanks
Dungol