File Does not Reflect on master after merging from another branch

Hi ,
Please refer below steps to reproduce it.

1. I merged Dev Branch into Master refer screen shot "Git-Log" .
2. Refer master branch in same session "Master-Branch-with-New-Session"
3. Refer Dev branch in same session "Dev-Branch-Same -Session"
4. Refer Master branch in a new session "Master-Branch-with-New-Session" . I just logged out and the logged in again.
5. Refer "After-Click on dev file in master Branch after new session" file when i clicked on file "dev.txt"

Thanks,
Gaurav