Just pushed an update that should help fix the emojis not updating in the picker as you use them. Try using certain emoji reacts, then after you've used them several times, refresh the page and see what happens. I'm going to continue working on better styling for this across devices. The big problem with having 25 reacts in the picker is that on some hardware it just straight up crashes and we don't want that to happen. It's a balancing act.