BUG: iPhone app does not synch book position to desktop

I opened Old Testament Theology on the iPhone app - it opened in the position I left off in Logos4 desktop.

I read a chapter.

I opened it on Logos4 desktop, and the read position was where I left off on the desktop - i.e. it had not recognised I had read a chapter on the iPhone app.

Shouldn't this synch both ways?