My players can see the Module I just purchased, how can I fix this

SO I just purchased a side quest adventure  and it was tarnished by my players being able to view the  the GM instructions of the module, most of my players are cool, but one in particular i could tell had advance notice of things.  it kind of put me off balance the entire session I am not inclined to make anymore marketplace purchases until I can figure out what happened here. HELP

Which module was it that you purchased?  It sounds like the permissions on that handout were incorrectly set when it was created.  The Roll20 Devs would need to adjust it so that doesn't happen to other purchasers in the future.