Yoast looking at code for readability criteria

Hi,

I have some code at the bottom of every blog post I write, which looks like a sign up box when the post is published. When Yoast is analysing my post, it’s also looking at this code, and giving me a poor score for readability. It never used to do this but it has started over the last few months. Does anyone know how to stop this? I hate seeing all the amber and red lights!

Thank you