What's causing this extra bar line and empty bar?

[Robert Hickman]

Hi people. I'm trying to reproduce the formatting from a tune that
started out in ABC notation, which is formatted with line breaks
around phrases instead of bars. It is working as intended, except for
an empty bar that's showing up after the first repeat sign, and I have
no idea what's causing it. Also there's extra space being added before
the other line breaks as well:

https://pureocarinas.com/res/lilypond/aikendrumnotation_0c01fcb19c471b86d2ab94badb4b7de55b3660f2.png

The following is how it should be formatted (generated by ABCM2PS).

https://pureocarinas.com/res/abc_converter/aikendrumnotation_0c01fcb19c471b86d2ab94badb4b7de55b3660f2.png

And here's the code, without the definition of the \strike articulation symbol.

\version "2.18.2"

\header {tagline = ""}
{
    \numericTimeSignature
    \time 4/4
    \key f \major
    \repeat volta 2 {
    \partial 4 f'8g'8 | a'4(  a'4 \strike) bes'8(a'8 g'8\strike f'8) |
d'2 f'4. d'8 \strike | c'4 c'4( d'4f'4) | a'4( g'4 g'4 \strike)
\allowBreak \break
    \partial 4 f'8g'8 | a'4(a'4 \strike) bes'8(a'8g'8 \strike f'8) |
d'2 f'4.( d'8 \strike) | c'4c'4d'(e'4) | f'2. \allowBreak \break }
    \repeat volta 2 {
    \partial 4 f'8g'8 | a'4( a'4\strike a'4\strike) g'8f'8 | bes'2
d''4.( bes'8\strike) | a'4c''4( a'4\strike) f'4 | a'4g'4( g'4\strike)
\allowBreak \break
    \partial 4 f'8g'8 | a'4(a'4\strike) bes'8( a'8 g'8\strike  f'8) |
d'2 f'4.(d'8\strike) | c'4(c'4\strike) d'4 e'4 | f'4. }
}