I assume that the gun is doing this when it is dry fired. If this is correct then what you describe is perfectly normal for the 870.
The way the 870 works is this. When you rack the action and put the gun into battery (ready to fire) there is an arm called the action bar lock that moves up and prevents the bolt and forearm from sliding rearward out of lock up until you pull the trigger.
When you pull trigger on a live round and the gun fires it recoils rearward but since you are holding onto the forearm the forearm moves forward in relation to the rest of the gun. When the forearm moves forward the action bar lock drops down so that you can slide the action to the rear and eject the shell and load another one. If there is no recoil then friction between the bolt and action bar lock keeps the action bar lock from dropping out of the way.
To simulate what I am talking about do this. On an empty chamber dry fire the gun while pulling the forearm to the rear tightly. It will not unlock. Now gently push the forearm forward and you should hear the action bar lock drop out of the way.
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