Not possible to help you without knowing:
- if you installed yesterday's update, which added a tweak to add extra invisible corner nodes to straighten the curve.
- the precise, exact, coordinates of how you place the points. If you haven't done another pushback from the same gate, they should still be there in the airport customization file, in these lines:
pushbackquickeditpos
pushbackquickeditapproachpos
in the section of that gate.
In any case, we should release another update very shortly, possibly this weekend, which will show a preview of the actual route as done with the current airplane+truck, which should remove any guesswork.