Deleted questions still in published file

I have a quiz with 10 randomized question out of 30. I deleted 2 questions from the 30 and did a new publish, but the deleted questions still pop up now and then. How do I get rid of them? I have even tried to create a new quiz by copying fom the old but the questions still come. It´s making me crazy. Is there a cache in the browser or what? I deteted all files from the server and published the new one but still....  Arrrrgh

Anyone else who has had thisproblem?