It's normal for there to be some variation in how long things take for different applications. You can easily see this using the application tracker spreadsheet. Contacting your MP is supposed to be reserved for a serious issue with your application, or where the application goes over 1 year without explanation from IRCC, not for things like "my BIL is 10 days late".
My AOR came a few days later than most other people on the tracker whose application was received on the same day mine was. There's no point in getting worked up over little things like this.
All the applications are being worked on by agents who will work at slightly different speeds.