You will need to take action to resolve this - it won’t go away on its own.
I took a quick look at your site in chrome dev tools, and it looks like the relevent code is related to adding the ‘chapel’ language to highlightjs.
If you visit your ‘Light’ theme, and hit ‘edit code’, you should be able to find this under one of the HTML tabs. Then you can follow the instructions in the OP of this topic to move it to the ‘JS’ tab.