An error occurred while saving the commentTimmy So commented
I had this problem before where a shift was deleted and remains empty and marked with a star indicator. When I printed the schedule, it kept showing the old assigned shift as if I hadn't removed it before. Once I click onto the scheduled shift and choose "Share", the star on the empty shift is gone, thus allowing me to schedule the shift again.
I think somehow after deleting a shift, it still needs to be "shared" to become effective. See if this applies to some of the reported cases.