I Can't choose the same character again on SAMP

I'm using SAMP 0.3d. I'm using the server "UIF 0.3d - United Islands Freeroam". I Only started playing on the server today, the first time i used it, i used the character "Claude". (The guy from GTA3). Then i decided to change to a diff char. But then later on, i wanted to use clause again, but when i clicked him, i went back to my other guy! WHATS UP?