TOPIC: Earlybird Calculation Error on Pay Later modification

I have an EarlyBird discount active for a registration. When a user runs through it the first time, it calculates correctly. If the user says they will 'Pay Later' then logs back in at a later time and Adds a member, the whole registration calculates at the regular rate and NOT the early bird rate. This obviously will be an issue. Anyone know how to get around that? I might just have to set the price.. then reset the price not offering the EarlyBird at all.