Female Mollies Acting Weird

[akelland]

Hi everyone I have 4 mollies 2 males and 2 females ( I plan to get more females as its supposed to be 3 females for every male). My female mollies have neen acting weird they keep chasing the males and sometimes when still they wiggle like doing a little dance and the keep swimming up n down the tank looking at their reflections anyone know whats wrong with them? Thanks