Why when I place a Player Start do I fly instead?

Okay so I have just recently had a problem with UE4 and when I make a player start for my current project and try to play in either view port or standalone it just makes me fly instead of walk. I had it working and had a head bob but it all randomly stopped working. Have I clicked something or made an error?

Please help I am stuck :')

Make sure your current character is being used as the default pawn. You can check by going to Blueprints>EditGamemode>Edit>Default pawn

That was it thank you so much :smiley: