Pack n Play Mattress Cover?

We had a neighbor give us a Pack n' Play a few months ago. We plan on using it so our baby girl can sleep in our room for the first few months. Upon setting it up, we noticed that the mattress cover seems pretty loose, and seems to bubble up at the spots where the mattress folds when packed away. Even after putting a Graco fitted sheet on, it still seems loose. Does anyone else have a smiliar issue with their mattress cover? Is it still safe to use? In a FTM so I'm a bit paranoid...
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