Worksheet_SelectionChange Doesnt Trigger at every modification made

Dear all,
Below event doesn't trigger at when i make any changes in column 17.
I checked immediate window, Application.EnableEvents is true.
The gets updated after i double click on any cell.

Actually below code runs correctly, but it wont trigger as soon i change the cell value in column 17.

Any suggestions how i can fix this..?

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Thanks a lot for your response..That did the trick..