The default position of the start node is quite annoying. As nodes snap to a different grid and you can never get the line to be straight.
When you move the Start node it then snaps to the correct grid and it is OK. So I guess it was forgotten when the grid changed.
I will have a look to see if I can find this bit of code and make a PR, but will be quite a search. As I only deal with nodes normally.
If someone can send me in the right direction that would be nice.
ps. Yes I know this is nonsense. But should be a small change anyways I guess