When running emacs in a terminal, evil-cleverparens does something extra-funky to the keybindings.

Steps:

• run emacs in terminal mode (I've tried iTerm and terminal on OSX)
• with evil and cleverparens mode on, move around the buffer using the arrow keys
• feel slightly guilty for not using hjkl, but then shrug it off and move on
• press v to enter visual mode
• exit visual mode
• press the up arrow

Result:

• chaos, cats and dogs living together...
• also, the up arrow appears to be interpreted now as M-O followd by A', with the result that you end up in insert mode, on a new line above the current function, with a capital letterA`.
• some other bindings do weird things too - the arrow keys and the mouse-wheel are the ones I have noticed

Turning off cleverparens mode restores the normal functioning of the arrow keys. Also, as noted above, the weirdness does not start until you enter and then exit visual mode.

In case it matters, I see this behavior in Spacemacs.