Required Fileds

I’m busy testing a form and have an issue with the required fields.
When a required field is not completed it puts the text “Please fill the required field.” but then the field is no longer accessible via the mouse to then fill in the field.
Can you please suggest a fix for this, thanks.
The Form in question is linked below.

http://pcrepairsinnewcastle.co.uk/contact-no-3-dukes-cottages/

https://ww.wp.xz.cn/plugins/contact-form-7/