You say that you have inserted your own image withing blockquote tags but I can’t see them using view>>source. I can only see one blockquote element on the page.
You also said that you had added a quote and used white over a white text over a white background to hide it. I can’t see where that is in the source either.
Another way to hide stuff is to declare display: none in your CSS but for me that’s not a perfect solution.
The code used to insert that quote is a bit tricky for me. It uses :before to insert content and it uses position: absolute. The other thing that is happening is that the images you use to insert the quotation marks have become links which when clicked, take the visitor to the image itself. Not a good experience.
I am guessing now that the original quotation mark images were inserted by the theme’s code and you have hard coded your images in yourself? I don’t quite understand how or why you made them links. I wonder if a better way to add them is to work out how the theme does it and replace that code but that would be beyond me.
I’m no expert but I am really good at Code Staring which I have practiced over many hours! Sometimes I can will raw code into submission (but not that often).