I need some help. On my wife's iPhone 5s calendar events don't show up on lock screen. They are in the calendar. They are reported in the Notification Center, but there isn't any alert on the lock screen! I tried to set some events on my iPhone (we share the calendars from family), they showed up on her iPhone, she accepted them, but at the time of the event I received the alert on my lock screen (on both my iPhone and iPad) while she didn't receive any alert ! It drives me crazy, I can't understand the cause. All the settings appears to be the same on our devices. Thank you in advance for any suggestions.