Question about understable discs

For reference I am almost exclusively a RHFH player, and I am trying to work on some new shot types(hyzer flip mainly) however last time i was out on the course i tryed to throw a hyzer flip using both a Daedulus and a Flare, both held onto the hyzer line and banked hard instead of popping up. What potential issues could be causing this? Also side note about a year ago i was toying around with my buddys disc and had no issue hyzerflipping a Signal.