The developer makes a script wich installs the rom. Inside that script he can specify what happens when you install the rom. If the dev of this rom put inside that script the command to wipe the internal memory, that is what your phone will do while installing. So you cannot say it is normal or not.
I guess he would have put it in front page if the ROM was supposed to wipe internal memory...
Edit: false alert. For some reason, solid explorer couldn't see the internal memory. Flashed back to CM10 and my files are back here.
Last edited: