istandalone, that razor (the fatboy) is an outstanding piece of equipment and the blade must NOT rattle. The blade is firmly supported by the silo doors (from above) and from four bars (from below). The clicker adjusts the position of the four protruding bars, modifying the blade exposure. The silo doors are fixed, once closed. Only the four bars are adjusted in order to modify blade exposure. Probably something is loose/unengaged/unscrewed in your razor, at the moment. I'll exclude a problem on the safety bar side, even if they are bent, because a bent safety bar would surely modify severely the correct blade exposure but if I'm not mistaken the blade even in this dire circumstance should be supported by the four protruding bars, anyway.
Originally Posted by istandalone
Razor: Fatboy, Slimboy, Tech, Knack.
Brush: Kent H8, BK4, Omega boar (small, big).
Soap: Woolfat, C&E Nomad, Proraso Green, Tabac, Cella.
Cream: Valobra Mentolo, TOBS Sandalwood.
Aftershave: Floyd Blue, Proraso Pre-Post, Dopobarba, Crema.
Other AS: Chimique Clinique, Capucci, Cerruti 1881.
All items top to bottom in my taste- YMMV