My best guess would be either a tight extractor or the ejector tip "angle", pivoting the case into the edge of the ejection port at more of a 90 degree angle, rather than up and out. The good news is the gun still runs 100%! If you have a spare, try a different extractor first, before messing with the ejector - they are seldom a problem. Your Officer's should have an "extended" ejector, I believe.
Warmly, Col. Colt
"Beware of Counterfeits and Patent Infringements"