A line beginning with ' or . in a groff file has a special meaning and cannot be used for literal text. Instead the interpreter will try to execute it and fail doing so. A zero-width space or reformatting the paragraph can be used as simple workaround.
This problem was detected using: LC_ALL=en_US.UTF-8 MANROFFSEQ='' MANWIDTH=80 man --warnings -E UTF-8 -l -Tutf8 -Z man/batctl.8
/dev/null