Collection Repeat Broken

I Just upgraded to v1.0.0-rc.1. I was on beta 14 previously before that. I have a collection repeat which was working fine. After the upgrade, it seems the collection repeat is now broken because after I scroll around 10 items, I start seeing items that were already there before and then empty entires before
I start scrolling into a blank space.

Any one else seen this and any help?