One of the major problems with our legal system is that one may be charged with resisting arrest without actually being charged with anything else.
That's not true. While you can be "Charged" and prosecuted in court with
only resisting arrest, the prosecutors will ONLY file it if you
resisted a lawful arrest. If you didn't know you were under arrest, then they won't file it or you will win in court.
So let's say you stole some shit from the gas station. You ran from the police after they said "Stop you are under arrest!". When they put the cuffs on you, they arrest you with crimes of stealing and resisting arrest. The prosecutors have the authority to pick and choose what to actually prosecute you for. They can say, "Well, let's just give them a citation for stealing but prosecute them in state court for resisting arrest". Or what if you just had some warrants? You can't be charged with warrants, but you can be charged still for resisting arrest.
So to answer your question, it is impossible to be
charged with resisting arrest without actually being charged with anything else
I can totally understand why you would think that, because it is not common knowledge or experience for many. It's also confusing because of the way the justice system works.