Why has my pop up stopped working?

Hi so I’ve been using a pop up for a while now and everything was fine. I decided to check it and noticed that it stopped showing from 9th march onwards. I went back though and figured out that that was the day that I installed klarna on site messaging on my website. Other than that, I cant see how anything else i did that day would have affected my pop up. 

Do you think that it is klarna that is stopping my pop up? Is there a way around this? 

Thanks