there is this bigger download circle is shown on the post page while uploading a file on it
This looks like a published or previewed post, not the editor, right?
Looks like you are missing some css. This could be a problem with your ghost install or your theme.
Are you on windows? There’s a known problem with installs on windows failing to build the required card assets. I recommend installing in wsl to avoid it — that environment is much better tested.
Is this a custom theme? If you switch themes, is the problem still there?