ANSWER TO MY OWN QUESTION
This was something I had been trying to debug for the last couple of days. And the answer was found by mistake.
What caused the error was caching. I had to exempt the cookie from cache in order for it to work as it should.
So, if you are experiencing this behavior and start a debug quest that you know will bring you pain and misery, check your server settings or give your hosting provider a call first.
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