Default low alerts volume with Resurrection v5.1.5

hi,
i just installed Resurrection Remix 4.4.2 KitKat v5.1.5 on my i9100,
everything works great except the alert's volume, the volume is very low in both messages and calls alerts... i can barely hear nothing.
i checked if something is wrong with the setting but all volume bars are on max.

anyone have encountered this issue?

thanks!