Spent hours on a similar problem - my guess would be that yours is the same and it is a problem with the loop itself. Can you paste what you are using to generate the loop and what the loop looks like in the tag dump?
Edit: sorry just reread the post and saw that you're using Pagebuilder - may be a completely different issue.
Edit: sorry just reread the post and saw that you're using Pagebuilder - may be a completely different issue.