Not sure I understand, it supposed to work well :/
Here for example just click once on the vodka bottle (top shelf, first one on the left) , once on peach schnaps (top shelf, first one on the right), twice on pineapple juice (table, first one on left) and finally twice on cranberry juice (on the right of pineapple juice). There are 6 doses in total and the shaker holds 6, so it's all good :)