Can't type in form fields on live form

People who are trying to register on my form say the form will not let them type in it.  The place the cursor in it and start to type but the letters just disappear.  Here is the form link  https://secure.jotform.us/tsra/CandK 

All of our other forms work great.  Just not this one..

THANKS!

THANK YOU!   This worked for me!