The reason you are seeing double 1 callouts in your AsciiDoc output is because the callout syntax requires the number to appear twice for each annotation. The first instance, <1>, is placed inline within the source code block to mark the specific line. The second instance, also <1>, is placed outside the code block to define the explanatory text for that callout.

This double-numbering system is how AsciiDoc correctly associates the annotation text with the exact line in the code block. It's a fundamental part of the syntax, ensuring that the callout number is not part of the copied code when a user selects the text.

How AsciiDoc Callouts Work

• Inline Callout: The <n> where n is the callout number, is placed at the end of the line you want to annotate inside the code block.

• Annotation: A corresponding <n> is placed on a new line outside the code block, followed by the explanatory text.

In your provided input, the line from: local-cluster <1> correctly marks the line to be annotated. However, the first explanatory line is also <1>, causing the output to render the first callout as 1 twice. This is an error in the provided input. To fix this, you should have the explanatory text start with a different number, such as <1> for the first explanation, <2> for the second, and so on, which you already have for <2>, <3>, and <4>.
 (gave corrected input, but the only difference was a hidden space){{}}
By placing the callout numbers outside the code block, you are correctly instructing AsciiDoc to associate each explanation with its corresponding line.