Look into ctrlp ":" bug

[esneider]

Typing ":" does not work as expected, which is being a literal

[esneider]

It's not a bug, it's a feature!!

End the string with a colon ':' followed by a Vim command to execute that
command after opening the file. If you need to use ':' literally, escape it
with a backslash: '\:'.

[esneider]

Pull request to allow disabling: kien/ctrlp.vim#501