[whpalmer4]

I'm going to guess that it only appears that you have one-way syncing. Did you bring up the All Items perspective to look for the missing actions? Look at your settings in the Data panel of the preferences -- what do you have selected for cleaning up inbox items, and the default list for single actions? If you have something other than "both a project and a context" selected, check whichever list it shows as the default list for single actions, and you'll likely find the missing actions there. The desktop and the iPhone versions may behave somewhat differently with respect to inbox items, depending on the options I mentioned, but I run with "both a project and a context" selected (which avoids this) and will let someone else comment further.

It's not impossible that you have uncovered a bug, but let's first rule out any cases where the program is operating as designed, if perhaps not as you intended.