Redoing New Words: Genki I - Vocabulary

I’m doing the Genki I - Vocabulary course created by Narcey. For some reason, when I do new words on either my desktop PC or on my iPhone, often, the progress does not sync. Example, I’ll do 5 new words on my desktop, but when I check for reviews later on my iPhone, it will show that I never attempted those new words. Just a minor annoyance, would be great if a solution was found. I don’t want to waste time waiting for SRS to kick in when it isn’t working.