The ACLItems is the defining table to determine if they are allowed or not allowed to that page (you can allow/disallow users and roles).
My guess is that the user exists on the staging site but not on the production site. See what users exist on the Security rules for that page in staging, and check to see if those users exist in production.
If not, you can either update the user so it generates the staging task and push, or do a full sync on the users object, but be careful with full sync if your environments have different users, better to just push the 1.