cant make avocado burgers in burger island is it a bug?

evertime i make an avacado burger when i go to put the catsup on, it goes away, like i did it wrong... is it a bug? please help! im way up on that level, so now i cant get past that... i bought the avocado burger... and of course now when i put the catsup on, it bleeps out.. any suggestions?

It's because you're not supposed to put ketchup on the avocado burger, the recipe calls for the pink sauce. :)