Bug after saving the page variable (Video included)

Hey there. I am trying to save list of texts/numbers after get the answer in this post. However, after I click save, the page variable is automatically alter.

The following is the video of my screen.
page var bug

There is another bug that present on the same page. I do not know either it is related or not.

I created a javascript logic. That link to Google appscript. However, it does not receive the same response. The response should be in blob format.

This is the response that Google Appscript produced:

And this is the response that I received in Appgyver:

Previous app works fine and return the response exactly.

When I recreate the JS advance and copypaste the same coding, it return different result.