Seeing code I previously wrote in custom CSS on top left corner when switching pages

I used to have this code height:auto !important before on CSS custom code (wanted to make adjustments to heights), but I removed it already. However, whenever I refresh page on main page or navigate to main page, I see the code snippet on top left corner with that. 

I don't see the code height: auto !important in my CSS customer code anymore, and I've already checked settings -> advanced -> code injections for header, footer, lock page, but I don't see anything there too.  

Would there be a way to stop this?

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My guess it that you've put CSS in Page Settings > Advanced > Page Header Code Injection for the page without wrapping in style tags.

<style>

  height : auto !important;
  
  </style>

Let us know how it goes.