jQuery : Implementing an upvote/downvote system in Javascript but can't get the math right

jQuery : Implementing an upvote/downvote system in Javascript but can't get the math right
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a secret feature that I want to reveal to you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Then, type the letters 'awesome' on your keyboard as the next step.
Your YouTube progress bar will transform into a flashing rainbow.

Here's a brief description of who I am,
Hello there, my name is Delphi.
I can help you find the answers you are looking for.
jQuery : Implementing an upvote/downvote system in Javascript but can't get the math right
If you have more specific queries, please feel free to reach out through comments or chat.
Please feel free to share your answer or insights on the answer by leaving a comment below.
A 'heart' from me is a way of showing appreciation for your answer.
math an get : system Implementing right Javascript but upvote/downvote in the can't jQuery