Hello, I am trying to figure out the top of the banner…

I am not sure why the banner appears as cut off. I am trying to figure it out, so please bear with me. I do not know if I need to give you different dimensions. Perhaps I requested measures that are too wide? Although it seems only the height should matter.  I have set the height to 600 which is the same height of the banner, so it’s a bit perplexing.  Thank you for your patience!

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