Elementalist Lux doesn't like Nexus Seige

So if you bring elementalist lux into nexus seige and you change forms in the first round, it does not transfer over into the next. I had only gotten to change to fire my first round and it reset back to light the next one. I have no issue resetting to the light form for round 2, however I could not choose fire during this round. It was grayed out as if It was my second time evolving. I don't know how you would want to fix; either transfer the forms entirely to the second round, or completely reset the forms as if a new game started, but I figured attention should be brought to the subject. Thanks for your time. PEACE