Can passbook be hacked into?

I've been getting notifications about value being added/ subtracted from my Starbucks card but I don't have one! It's like someone put their car in my passbook (or else found an old card I used to use and is somehow using it in stead of me). My passbook also shows an AMC stubs card with value on it, and the owner name is not mine. What is going in with my phone? Should I just delete these or is it indication that someone has access to my info?

Please help!