Decimation mod problem

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  • I created a server using decimation mod (1.7.10), and when I try to shoot mobs using firearms, the bullets don't do any damage. But, when I play in single player mod (offline) the firearms works very well. Does anyone here know how can I solve this problem? Before someone ask me about some stuffs:

    -My java is the latest version;

    -I already tried to reinstall java;

    -I tried to use other launchers;

    -I downloaded decimation again;

    -I use a vanilla version (maybe can be this, but I need someone to test it for me).