You say, that you have the same permissions as your team member, but given your description, I would question it. Can you double check that your team member is the very same groups as you are and that there are no special user-specific permissions on top?
I agree with Jörg Hoh Compare the group membership with your team member , sometimes nested groups give an issue. So even if you are assigned to more number of groups chances are ACL might have been set as Deny for some group on "sites/pages"leading to this.
Check that Access control editor in CRX explorer to validate.