On Clicking a textbox in webpage text on page hide and then show ( flickers)

I am working on a website: http://ift.tt/2sqX3e4

I have created a textbox, in which if I enter something, character count will be calculated via Jquery and get displayed in place of default character count.

I as soon as I click inside textbox everything on page kind of flickrs, No Idea why this is happening.

Any pointer will be really appreciated.