Cube Draft Bug

Hey guys. Me and 2 other mates have been trying to sort out a cube draft. We used the preset Battle City cube (the host was on Google Chrome). 

We kept encountering the same issue where it would get to the final card from the first draft of packs, and one player couldn't select it as it had already been chosen by another player. The draft would then just be stuck on this page. We've tried changing number of cards per pack and also adding a timer in the hope it would force us past this page - no luck. On 2 of the 6 ocassions we tried, it did make it past the first few packs, but most of the time it would freeze after the first rotation of packs.

Any help greatly appreciated!