Fillable pdf and text wrapping

I am still learning JavaScript and at a first glance it seems like there's nothing wrong with the script.

But I would've declared the willCommit event slightly different, and I would use this script as a Custom Keystroke Script.

Make sure this is where you're running the willCommit event from. 

Hopefully someone with more experience can confirm if what I'm observing is correct.

But anyhow, this how I would use your script as a Custom Keystroke event:

if (event.willCommit) {

     if (event.fieldFull)       this.getField("What happened 2").setFocus();

}

Like I said, I am unsure if I did it right, but I am typing from a mobile device and I haven't tested if the script above is OK or will throw any errors.

However,  I think the most important observation is that I noticed that the texfield objects have very long name as sentence phrasing with spaces in between words.

That is not a good field object naming convention when using Acrobat JavaScript since it is known for sometimes throwing errors, specially if a field object is used for calculating events.

I would suggest to first try your original script  but changing the fieldnames to something short and preferably using a parent-child naming hierarchy, like for example:

"How.0", "How.1", "How.2", etc.

"What.0", "What.1", "What.2"

"Change.0", "Change.1", "Change.2", 

Let us know if this helps.