In all likelihood, there is unburnt powder particles or residue under the extractor star. A good cleaning with some solvent and a brush should eliminate them. Holding the gun barrel straight up when extracting the empties helps eliminate this problem, but it may re-occur, it is a fact of life with revolvers. Keep a brush in your range bag.
Thanks for the tip on the range brush. I looked and it's clean. I'm sure my idiot tail bent the extractor as I tried to use it to grip and push out the stick brass. I can see a ever slight gap on just one side of the extractor and cylinder.