Syncing iPhoto and iPhone4.

In iPhot my events are set up properly.

However when the iPhone4 syncs it splits up the pictures in the events.

For example EventX may have 8 photos in on iPhoto, but when synced I will get EventX 3 times with 2 pics in one of them, 2 in another etc.

Has anyone else had this problem?

How can I resolve it?

Many thanks