Ibanez RG120 guitar tremolo/bridge question?

okay so i got a new guitar. It's an Ibanez RG120 and the whammy bar falls out when i tilt the guitar foward. The bridge is like a american standard strat bridge. it can go both ways up and down but its not a floyde. A "poor man's floyde" some ppl say. Is the whammy bar supposed to just slide in? like it feels like there is nothing holing it in. when i first got it, it felt like a rubber ringish thingy held it in but i feels like nothing is there now. and it falls out. help plz cuz i dont wanna replace it concidering i just got it.