I confused myself fairly seriously today.
The other day, I created a couple of 'Field Notes' against a couple of caches I am working on.
Today, I thought I was logging a few finds and found they did not register on GeoCaching.com!
I found out that the 'Field Note' was checked and all my 'logs' had been recorded as 'Field notes'. L4C was showing the caches as 'found' (smiley face) whilst GeoCaching.com was showing them as not found.
I use an iPhone 4s, so the 'field note' tick is a 'scroll down' to see. I am sure on an iPhone 5 or iPad, it would not have been an issue.
Just thought I would share my experience on this.