Javascript code being triggered twice

[shrewd ledge]

Hey there, i am facing this issue, where when i click my register button, the js code that sends http request with registration to the backend server is triggered twice. i tried fixing it, but nothing helps.
html: https://paste.md-5.net/hetubilela.js
js: https://paste.md-5.net/pericinofa.js

[pulsar ledge]

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Hey @shrewd ledge! Please use /close or the Close Post button above when you're finished. Please remember to follow the help guidelines. This post will be automatically closed after 300 minutes of inactivity.

TIP: Narrow down your issue to simple and precise questions to maximize the chance that others will reply in here.

This is not a JavaScript server. [Java](https://en.wikipedia.org/wiki/Java_(programming_language) and JavaScript are completely different languages. See: How is JavaScript different from Java?

[elder estuary]

As the bot said, this server is for Java, not Javascript. Good luck elsewhere