Sprite movement - need help with consistency

Hi there. I'm trying to make a sprite move in a specific direction and with physics type behavior to act like a soccer goalie. I've got a movement that's looking pretty good, but every time I run it it doesn't work the same way.

I need some help making it consistent please.

Here's a capx to play with. ( replace the dot and spaces with a . (dot) and add h t t p before the colon

1drv.ms/1OYj3qG

TIA

I've pinned a sprite ani to the sprite that's doing the movement. Run it a few times and see how inconsistent it is. Click the green button to trigger the movement

1drv.ms/1OYj3qG