Submit button has to be clicked twice

Hi Wendy - the client I am working for has asked for no feedback so we have removed the 2 layers. I have set the items to snap back if they are incorrectly placed. My example was purely to illustrate the Submit button problem :) 

The idea is that the user can only progress once all items are correctly dropped. - I managed to solve it by checking the box in drag and Drop options labelled "Delay item drop states until interaction submitted". 

Thanks for your time though :)