NodeJS Input prompt-sync module unexpected behavior - node.js

Question

I am using node js npm prompt-sync module. I have read that prompt-sync does not handle multiline inputs well, but none of my prompt inputs have \n characters. My expected output is to prompt, receive the input, then begin handling different prompts. This same code (similar to Main.js) works fine in Jest and produces the expected result. The observed result is that, upon answering anything, the line is printed again automatically with the given input without asking again. Then, there is no prompt given. But, upon typing more characters, it will repeat the prompt. It will also add previously repeated characters to the list of characters being returned.
Why is this happening and how can I produce the expected behavior?
UserInteraction.js:
class UserInteraction {
createPL(): {
console.log("Generating new PL: ");
let double_sided = prompt("DS? (Y/N): ").toLowerCase() === "y";
// other, different prompts...the expected output is a different prompt each time.
// use inputs for creating an object
}
createPLMap(): {
let cont = true;
let plMap = new Map();
while (cont) {
let pl= this.createPL();
// CODE REMOVED
}
return plMap;
}
Main.js:
const UserInteraction = require('./UserInteraction').UserInteraction;
async function MainAwait() {
let ui = new UserInteraction();
let pricelineSMap = ui.createPLMap();
}
MainAwait();
Shell file:
Main.sh:
node --trace-warnings ./js/Main.js
Output:
./Main.sh
Generating new PL:
DS? (Y/N): y
DS? (Y/N): y
y
DS? (Y/N): y
y
y
DS? (Y/N): y
y
y
y
DS? (Y/N): y
y
y
y