Only first inventory slot works in multiplayer

I'm playing with someone in my home and I join their game. I can fill my inventory on the bottom but only the first slot on the left works. If I tap on any other slot, the only thing that appears is what is in the first slot. This doesn't happen on local creative, only when I log into someone's game. I'm using an ipad Air but it's not listed above. Using 0.8.0alpha, also not listed above.