Today something happened to me. Got, in 5 rice balls, 2 Swamp Broomsticks and +3 items. The broomsticks were stacked together. I changed maps and then, pff, one suddenly disapeared. After trying item hunting again, 15 rice balls suddenly disapeared and 2 items were found, also the system glitched and I couldn't do anything. So yeah, guys, just hold your riceballs till the system is working 100%.