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I'm not sure what causes that. Should I take it down and reupload since it's too late to make changes now?

I would go to the paragraph where the gray box starts and hit backspace all the way until you get to the previous sentence. This deletes any leftover code and should get rid of the box. just click edit at the bottom of the post and you can make it happen!

Thank you Derrick! Still getting the hang of things here : ) Grateful the community is so supportive.

Just be aware of it in your next posts, It has happened to be aswell when using that blockthing, for some reason, it does that with the text.