I have checked you website and the behaviour of the portfolio items works fine for me. The featured image is ok and when the mouse is over, the title and text appears. What do you want to change exactly?
you have to add the plugin “Contact Form 7 Captcha” (by 247wd) to work that option fine.
When you have added that plugin correctly, in the setting of the plugin you have all the information and options to installed it correctly.