Why are the text formatting tags different in a comment than to a question/answer?

Question

In a question/answer, the Bold tags are 2x asterisks:

**Bold**

And Italics is a single asterisk:

*Italics*

However, in the comment fields, why are they different?

Sorry. I previously had single asterisks below. Infact, it should have been double.

Double asterisk for Bold:

**Bold**

And underscore for Italics.

_Italics_

I sometimes get confused and commenting and/or writing a question/answer.

EDIT: So, I got this info from the 'help' buttons. In the question/answer help icon, it automatically used asterisks only.

However, in the 'help' of the comments, it states to use underscore:

I have just always followed the 'help' buttons.

Answer 1

That's not the case. Stack Exchange follows the normal Markdown syntax in both cases:

Emphasis

Markdown treats asterisks (*) and underscores (_) as indicators of
emphasis. Text wrapped with one * or _ will be wrapped with an HTML
<em> tag; double *’s or _’s will be wrapped with an HTML <strong>
tag.

E.g., this input:

*single asterisks*

_single underscores_

**double asterisks**

__double underscores__

will produce:

<em>single asterisks</em>

<em>single underscores</em>

<strong>double asterisks</strong>

<strong>double underscores</strong>

You can use whichever style you prefer; the lone restriction is that
the same character must be used to open and close an emphasis span.

Basically, double of either character is bold, and single of either character is italics.