Hi,
Earlier today I discovered a bug in the latest release described here.
http://support.advancedcustomfields.com/forums/topic/empty-repeater-field-displays-container/
In short, an empty repeater is deploying the “while” html instead of the “else // no rows found” as it should.
I downgraded to 5.1.0 which fixed the problem.
I suspect a fix described on the blog could be a source of the conflict. http://www.advancedcustomfields.com/blog/acf-pro-v5-1-1-update/
“Field group: Fixed bug where sub fields were deleted when moving a repeater field to another group”