Several people have told you what to do to correct it.
First make sure there are no burrs etc on the mechanism which extracts the shells.
Next wrap some 600 grit polishing cloth around a wood dowel. Constantly turn the dowel in the same direction until you have a high polish on the inside of the chamber, being very careful not to lengthen the chamber at all.
If you have a cratex tip and are careful you can polish the chamber to where the inside is just plain slippery.
Also be careful not to polish to long at any one spot.
The 9mm has a fairly sharp taper so should be pretty resistant to sticking already so I would guess you have a really rough chamber or really hot ammo.
“If someone was holding a Beretta Jetfire in .25 auto on me, the last thing I would try to do is take it away from him. If I did, he just might put 7 bullets in me for my efforts.”
I got one of those for my 16th birthday. 50 years later I still use it as a BU gun in my car. Fine little firearm.