the end of the chamber is not exactly lined up with the forcing cone more than likely. Yes, a smith needs to fix it.
Its generally referred to as a timing issue.
All the above is good advice. My money is on the cylinder timing holes being worn.
You really should include the made and model of the gun when you ask a question like this. If this was an older Ruger Single Six or Colt revovler - I would say take it to a gunsmith. But if it is an Iver Johnson or H&R - I would say take a hack saw to it, or, sell it as parts - as these models have very little collector value, parts are hard to find .......... and worse......... expensive repairs do not seem to last very long on these bottom of the barrel revolvers. No sooner do you get one part fixed - another breaks.
You tell the smith that your revolver is out of time. It happens from time to time with loose or worn parts. It is known in the smith world as a tune up. It does sting your hand when the pieces of lead are shaved off on the forcing cone (part of barrel that meets up with cylinder) and deforming the bullet affects accuracy. Good luck.
It would be best for a gunsmith to fix it. There are a number of parts that can cause the cylinder not to line up with the barrel and shave lead. First are the cylinder lock notches, the cylinder lock, the cylinder lock pin, and the cylinder lock spring. If any of these are worn separately or in combination the cylinder will not line up with the barrel. When the gun is disassembled down to the point of replacing these parts, the cylinder hand has to be retimed so the cylinder lines up properly.