Visitors to my blog were suddenly unable to leave comments on pages created with ALB using the Enfold theme. When they clicked “Post Comment,” their text disappeared. I was able to replicate the problem. However, the issue was intermittent and did not affect all visitors. It appears to have cleared up when I turned off the Jetpack option to allow people to comment using a social media profile. (Thanks for a wonderful, versatile theme!)
Thanks for reporting this, so the problem is fixed now? If you need further help then please post a link to where we can see and reproduce the problem.