I figured out whats the issue. The submit button has become invisible. The arrow next to text message box doesn't work as submit button. if you hover your mouse below the text form you see the hand icon and if you click on it, the form gets submitted

i have attached the screenshot. the submit button is there hidden.  if you click on it the form gets submitted. 

Your arrow is not working as submit button so i added a new submit button in contact form 7 

<div class="submit-btn-wrapper">
   [submit "Send"]
</div>

and used custom css to align it but its not looking great but its working

.wpcf7 .submit-btn-wrapper {
    text-align: right;
}

My solution is a workaround. I want that arrow to work. can you please check and make it work. i am not able to place the submit button correctly so it doesn't look good 

This worked. Thanks.