Egypt Levels

Has anyone else had this happen? I get two or three orders done at once, usually all mummies, and if I click them through too fast, it won't let me give the next customer a menu, and it deducts a lot of money...not exactly sure why...am I the only one?

This happened to me 2 or 3 times. I dont remember for sure, but I'm willing to bet it happened on the Egypt levels, since I have been stuck on this one level for many, many moons & it just happened yesterday.
PS: This game is hard!! I'm almost ready to give up because I dont think that I could possibly do any better. (I've restarted once before & created a second file but this time I'm way too far along to restart. And the thing is, I have pretty good upgrades. I prob should have gotten the fridge or the last drink thing. Maybe.)