It looks like the caret advances four times (with a note added each time), which would indicate to me that you’ve pressed G four times, as @StevenJones01 has described. Are you positive that you haven’t pressed an extra one before the dotted minim?
half note G in the first bar ( caret at the beginning of the flow)
What do you get if you press 8 G T 7 . G ?
8 G T 7 . : I get whole note in the first bar tied to a half note to the second bar. 8 G T 7 . G: A whole note in the first and A whole note in the second bar to a quarter note in the third bar; all tied together.
What do you get if you run through the sequence of key-presses but without using the T key ? ie8 G G 7 . G ?
It is set to pitch after duration. It was the second option.
I change it from after inputing note to before inputing note and it does work now the way it says in the tutorial note.
I expect at some point you might have hit the K key, which toggles between duration before pitch and pitch before duration. This does light up one of the buttons in the toolbox on the left-hand side of the window: try hitting K a few times to see which icon lights up, and then you’ll know what to look for if this happens again in future.