Visible Lines/Underscores on Vim - vim

Question

I have these lines or underscores I am trying to remove on vim text editor:
The horizontal lines disappear when there is some text or code on a line.
Please let me know if you came across this before! Thanks.
Here is my .vimrc:
call plug#begin('~/.vim/plugged')
" The default plugin directory will be as follows:
" - Vim (Linux/macOS): '~/.vim/plugged'
" - Vim (Windows): '~/vimfiles/plugged'
" - Neovim (Linux/macOS/Windows): stdpath('data') . '/plugged'
" You can specify a custom plugin directory by passing it as the argument
" - e.g. `call plug#begin('~/.vim/plugged')`
" - Avoid using standard Vim directory names like 'plugin'
" Make sure you use single quotes
Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}
" Shorthand notation; fetches https://github.com/junegunn/vim-easy-align
Plug 'junegunn/vim-easy-align'
" Any valid git URL is allowed
Plug 'https://github.com/junegunn/vim-github-dashboard.git'
" Multiple Plug commands can be written in a single line using | separators
Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
" On-demand loading
Plug 'scrooloose/nerdtree', { 'on': 'NERDTreeToggle' }
Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
" Using a non-default branch
Plug 'rdnetto/YCM-Generator', { 'branch': 'stable' }
" Using a tagged release; wildcard allowed (requires git 1.9.2 or above)
Plug 'fatih/vim-go', { 'tag': '*' }
" Plugin options
Plug 'nsf/gocode', { 'tag': 'v.20150303', 'rtp': 'vim' }
" Plugin outside ~/.vim/plugged with post-update hook
Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': './install --all' }
" Unmanaged plugin (manually installed and updated)
Plug '~/my-prototype-plugin'
" Initialize plugin system
" - Automatically executes `filetype plugin indent on` and `syntax enable`.
call plug#end()
" You can revert the settings after the call like so:
" filetype indent off " Disable file-type-specific indentation
" syntax off " Disable syntax highlighting
Plug 'crispybaccoon/dawn.vim'
set background=dark
colorscheme dawn
" Access full color space
if (has("termguicolors"))
set termguicolors
endif
" sometimes fixes problems on some terminals
set t_Co=256
" Disable compatibility with vi which can cause unexpected issues.
set nocompatible
" Enable type file detection. Vim will be able to try to detect the type of file in use.
filetype on
" Enable plugins and load plugin for the detected file type.
filetype plugin on
" Load an indent file for the detected file type.
filetype indent on
" Turn syntax highlighting on.
syntax on
" Add numbers to each line on the left-hand side.
set number
" Highlight cursor line underneath the cursor horizontally.
"set cursorline
" Highlight cursor line underneath the cursor vertically.
"set cursorcolumn
" Set shift width to 4 spaces.
set shiftwidth=4
" Set tab width to 4 columns.
set tabstop=4
" Use space characters instead of tabs.
set expandtab
" Do not save backup files.
set nobackup
" Do not let cursor scroll below or above N number of lines when scrolling.
set scrolloff=10
" Do not wrap lines. Allow long lines to extend as far as the line goes.
set nowrap
" While searching though a file incrementally highlight matching characters as you type.
set incsearch
" Ignore capital letters during search.
set ignorecase
" Override the ignorecase option if searching for capital letters.
" This will allow you to search specifically for capital letters.
set smartcase
" Show partial command you type in the last line of the screen.
set showcmd
" Show the mode you are on the last line.
set showmode
" Show matching words during a search.
set showmatch
" Use highlighting when doing a search.
set hlsearch
" Set the commands to save in history default number is 20.
set history=1000
" Enable auto completion menu after pressing TAB.
set wildmenu
" Make wildmenu behave like similar to Bash completion.
set wildmode=list:longest
" There are certain files that we would never want to edit with Vim.
" Wildmenu will ignore files with these extensions.
set wildignore=*.docx,*.jpg,*.png,*.gif,*.pdf,*.pyc,*.exe,*.flv,*.img,*.xlsx
I have been trying to customize my vim text editor. I also have tried to install plugins for different themes. I tried using tree-sitter as well but that is not really working for me right now.

Answer 1

seems like the line
colorscheme dawn
was the one causing this issue.
i have contacted the theme creator and posted the issue on the github repository that i got it from. thanks guys!