Can't clone ctrlp repo '.' not being escaped

[JAffleck]

Explain the problem here ... https://github.com/ctrlpvim/ctrlp.vim

relevantinit.vim contents

...
Plug 'ctrlpvim/ctrlp.vim'
...

x ctrlp:
    Cloning into 'C:\Users\XXXXXXX\.nvim\bundle\ctrlp'...
    remote: Invalid username or password.
    fatal: Authentication failed for 'https://git::@github.com/ctrlpvim/ctrlp.git/'

See it should be getting ctrlpvim/ctrlp.vim.git/ but it's only getting ctrlpvim/ctrlp.git/

Git version:
git version 2.18.0.windows.1

Neovim doesn't let me copy version, so see screenshot below

• Type:
  • [X] Bug
  • [ ] Enhancement
  • [ ] Feature Request
  • [ ] Question
• OS:
  • [ ] All/Other
  • [ ] Linux
  • [ ] OS X
  • [X] Windows
• Vim:
  • [ ] Terminal Vim
  • [ ] GVim
  • [X] Neovim