Search result string gets inserted when opening file

- Category
- [ ] Question
- [x] Bug
- [ ] Suggestion
- OS
- [ ] Linux
- [x] macOS
- [ ] Windows
- [ ] Etc.
- Vim
- [x] Vim
- [ ] Neovim

I've been having a strange issue ever since I've started using fzf.vim. Any time I search for a term and select a file to open from the results, the file is opened and the search result string is inserted into the file.

Here are my settings:

```
command! -bang -nargs=* Find
\ call fzf#vim#grep(
\ 'rg --line-number --fixed-strings --ignore-case --hidden --follow --glob "!.gi t/*" --color "always" '.shellescape(), 1,
\ 0 ? fzf#vim#with_preview('up:60%')
\ : fzf#vim#with_preview('right:50%:hidden', '?'),
\ 0)
```

Any ideas as to why this may be happening? Thanks!