Recently we deployed Collector Version 10.4.0 on an iPad Mini 4. We set it up from our SDE, in disconnected mode and the map contained one tile package and one feature service (with ~400 line segments).
Our field inspector synchronized the data at the end of each day, and Collector told him everything had been synchronized. However, on our end in the office, only one or two days of inspections came through to the SDE. I'm looking at the iPad now, and all the data is on it, and it says it is synchronized, when it reality it isn't.
Has anyone experienced this before, and do you know why this might happen?