Please describe what steps you go through and what happens as compared to what you expect would happen. The code is on the page, so you don't need to include that inline.
The information you gave me to go on is:
"It's not validating the second instance of the behaviour (healthscreeningform_783)".
You have two different forms on the page... are you expecting them to both submit at once? How are you expecting this to all work? You submit page 1 first? Then they click to go to page 2? I'm a bit confused. Do you have a url where I can view this. I need a better description of what you are trying to do here.