Captcha- having issue when new user registers, if they get the captcha wrong….

I need help when a new user registers and put their user name and password in, if they make a mistake on the captcha, and then get the correct captcha and continue it gives them a random password and NOT the one they put in.

This is causing a huge amount of confusion for the user.

First I can’t even remember where the captcha was set or where I need to change it, does anyone know? I have been searching for a very long time…..

I have marketpress