Issues placing a text block over a code block image

Hi there, I currently have code block images on my home page, but for some reason when I place a text block over one of the images, a line appears under the text on both mobile and desktop. This isn't happening to any of the other images or text blocks, just this specific one. 

Does anyone know why this might be happening, and how I can fix it. I will provide screenshots as well of how it should look vs what appears. 

Can you share your website URL?

It is https://www.ministryofdetail.ca/

Passowrd: Detail123

I was able to play around with the alignment of the text to make the line disappear, but still wasn't sure why it was was doing it in the first place.

Hard to say what was going on without inspecting it, but as long as it's not affecting your website then that's good.