What you're seeing in that output is a list of all defined auto-commands.
You get Vim/NeoVim to list all defined auto-commands with the Ex command
autocmd with no arguments. This command can be abbreviated to simply
auto. So in order to have Vim/NeoVim display all defined auto-commands at startup, you probably have an
auto in your vimrc or
init.vim (which you confirmed in your comments.)
Note that it's quite common to use
autocmd! (with a bang) inside an
augroup as its first command, in order to clear the
augroup of any commands previously defined inside it, before adding new command definitions there. This is useful in case you reload the Vim script (such as your vimrc or
init.vim), to prevent the auto-commands from getting duplicated as they get defined again every time the file is sourced.
The pattern goes like:
... autocmd definitions ...
So I imagine you were missing the
! in the
autocmd! in the beginning of one of the
augroups... You can fix it by adding the missing