Custom workouts not syncing from iPhone app to Apple Watch

Not sure if it's user error, but I have an issue syncing custom workouts between my phone and apple watch. I have 3 x workout routines created on the phone but synced to the app. However, I've updated them to change repeats from 3 to 4, increase duration of times ones, etc. Whilst they show up in the phone app, the watch app still seems to show the old routine when I try and start it. It's as if updating the routine in the app, doesn't then sync with the watch. Is this normal behaviour?