HTML editor field is not aligned on the right

When I enter an editing mode with Atto editor, I see that its right border is not aligned with other elements on the page. The look differs depending on whether blocks are shown or hidden even though they are not visible on this page. Additionally when I open an html code, its editing field is not aligned with the editor tool box - the issue that I reported as we worked on BCU earlier.

When blocks are hidden and the editing field displays the result (not its code) then the page looks fine:

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