Range function gives an extra output in my template - go

Question

I am following this link to figure out how to create an archives page. I am using the hugo-xmin theme with slight modifications.
As far as I understand, range goes through the pages and should print them out. But, I am getting an additional 0001 also. I don't understand why. I'm still a beginner to Hugo and Go.
My output (circled portion in red not what I want)
My archives.html
{{ partial "header.html" . }}
<div class="article-meta">
<h1><span class="title">{{ .Title | markdownify }}</span></h1>
{{ with .Params.author }}<h2 class="author">{{ . }}</h2>{{ end }}
{{ if (gt .Params.date 0) }}<h2 class="date">{{ .Date.Format "2006/01/02" }}</h2>{{ end }}
</div>
<main class="content" role="main">
<div class="inner">
{{ range (.Site.RegularPages.GroupByDate "2006") }}
<h3>{{ .Key }}</h3>
<ul>
{{ range (where .Pages "Type" "post") }}
<li>
<span class="date">{{ .Date.Format "2006/01/02" }}</span>
{{ .Title }}
</li>
{{ end }}
</ul>
{{ end }}
</div>
</main>
{{ partial "footer.html" . }}
My archives.md
---
title: "Archives"
layout: "archives"
draft: false
---
This is archives
My directory structure
.
├── archetypes
│   └── default.md
├── config.toml
├── content
│   ├── about.md
│   ├── archives.md
│   ├── _index.md
│   ├── post
│   │   ├── first_post.md
│   │   ├── sample_code.md
│   │   └── test_math.md
│   └── reading.md
├── data
├── layouts
├── static
└── themes
└── mytheme
├── archetypes
│   └── default.md
├── layouts
│   ├── 404.html
│   ├── archives.html
│   ├── _default
│   │   ├── archives.html
│   │   ├── list.html
│   │   ├── single.html
│   │   └── terms.html
│   ├── index.html
│   └── partials
│   ├── foot_custom.html
│   ├── footer.html
│   ├── head_custom.html
│   └── header.html
├── LICENSE.md
├── static
│   ├── css
│   │   ├── fonts.css
│   │   └── style.css
│   └── js
└── theme.toml
15 directories, 25 files

Answer 1

I changed my archives.html to the following, with some help from hugo-lithium. It works for my use case now. But I still don't understand why the 0001 came up in the first place. So I will not be marking my answer as correct for now.
{{ partial "header.html" . }}
<div class="article-meta">
<h1><span class="title">{{ .Title | markdownify }}</span></h1>
{{ with .Params.author }}<h2 class="author">{{ . }}</h2>{{ end }}
{{ if (gt .Params.date 0) }}<h2 class="date">{{ .Date.Format "2006/01/02" }}</h2>{{ end }}
</div>
{{ range (where .Site.RegularPages "Section" "!=" "").GroupByDate "2006" }}
<h2>{{ .Key }}</h2>
<ul>
{{ range .Pages }}
<li>
<span class="date">{{ .Date.Format "2006/02/02" }}</span>
{{ .Title }}
</li>
{{ end }}
</ul>
{{ end }}
{{ partial "footer.html" . }}