You’re not getting it. Laying civil claims against someone is not a “doubling” of a criminal charge. They are two completely separate processes. They just happen to be handled by the same court system.
In a criminal prosecution, the state is charging you with violating the law, and must prove, X, Y, and Z elements beyond a reasonable doubt.
In a civil claim, a private party is claiming that you caused harm and that there should be redress. The standard and claims are different than for a criminal case.
In the case of O.J. Simpson, for example, the criminal jury found him not guilty of murdering Nicole Brown. But the jury did not rule that Simpson didn’t kill Brown. It only found that the prosecution had not proved the elements of murder beyond a reasonable doubt.
In civil court, Brown’s parents claimed that Simpson had harmed them by wrongfully killing Nicole Brown. In that proceeding it was found that there was sufficient proof to establish that claim.
In a criminal case, the government is charging you with offenses against the state and has several different ways of punishing you if the case is proven.
In a criminal case, a private party is claiming that you harmed him or her, and if that case is proven, then can get a judgment against you to make up for the harm you did.