Button requires double click to trigger

I have this page on which you first have to enter some information and then post the data. The issue is that - on mobile, when I enter the information it opens up the default keyboard on mobile and after I click the button (the one at the bottom) it does not trigger the onClick event listener of the button but first closes the keyboard. Only after it is done, clicking on the button triggers the expected function.

How can I make the button work on the first click itself? Thanks in advance.