That happens to me as well where I don’t get a curve (esp. if you’re zooming to another area close in range) however this is for what to do if you do get a curve and why it happened when you were zoomed in and then zoomed out. IMO, it’s much more noticeable if you lower the number of seconds (ex. 1). For my example code, I picked numbers that show the zoom curve in action (feel free to post the script in your story and test it out).
It’s recommended you first try zooming from where you are at your desired position. If you do notice a curve, then it is because of this.