Question about practice tests

I tried exporting a chemistry pdf from my college, but when it finally finishes loading up a practice test, the test generated has nothing to do with chemistry. it has to do with data, links, and computer science. why is this? is something wrong with the pdf? I checked it and have no clue how quizlet latched onto this and ran with it. because this feature is sooooo good and has helped me a lot with biology and my neuroscience class but when it comes to chemistry it just can't understand any file I send. Thanks!