[Lordzy]

It can happen if you're using server side money functions.
For example,

pawn Код:

new Srvrsidecash[MAX_PLAYERS];
stock GivePlayerCash(playerid, amount)
{
 return Srvrsidecash[playerid] +amount;
}

CMD:healme(playerid,params[])
{
  if(Srvrsidecash[playerid] <100) return SendClientMessage(playerid, -1, "You don't have enough cash to use this command.");
  //Using server side cash system.
  SetPlayerHealth(playerid, 100.00);
  return 1;
}

Such kinda problems are happening to some users.
It's because they give cash using other function(normal or server sided) and detect using another.

Check whether it's like that or not.