Issue with multiple edge selection from vertex in Beldner 2.79 I have been working trough a youtube tutorial on making a low poly space ship. After several attempts I can't get the same result as the instructor at time 5:30.
BLENDER-EP/02 - how to model a low poly spaceship 1/2

When selecting the a vertex, I notice not all edges connected to it are highlighted. It would appear I have some how created two vertices in the same point.

Is there a way to prevent this from happening? I have followed the Tutorial step by step multiple times yet I still get this issue and later on when I UV unwrap, my model is a mess. 

Thanks in advance. 

Tutorial:


My Model:
It's hard to tell how it happened, perhaps you've duplicated your mesh by mistake, anyway, select all and W > Remove Doubles and it will fix the problem.