[whpalmer4]

Not enough information to be sure of the cause here. One possibility is that you are showing Available actions on the iPod, and Remaining actions on the Mac, and the action is not yet available (has a future start date, or is not the next action in a sequential project are two likely causes for that). When in Contexts view, tap the little eyeball icon at the bottom of the screen and select Remaining. Does the missing action appear in the list?