Problem in Dijkstra's Algorithm

[rooch001]

Firstly Thank You very much for making us available this wonderful book .
I was trying to implement Dijkstra's Algorithm following the code available in the book.
But it is not outputting the correct result.
I also tested the code available in the repository.
For the same graph used in the code/book , the source is 'A' vertex and its distance from 'E' vertex should be 7 but the code is showing 8.