Unwanted naturals on teaching accidentals style

[francisperea]

Hi all, I'm just new to Lilypond and impressed with its capabilities.

One of my first tries with it was a set of scales for my own learning
changing key every two bars. I wanted to show the accidentals of the key, so
I used  \accidentalStyle teaching

The problem is that in the first bar of every key change it only shows the
key accidentals as I wanted, but in the second bar of every key change a lot
of unwanted naturals are shown. 

Any idea of how to get rid of them?

Thanks a lot in advance.

PS Here is the code I'm using, in case someone wants to test it.

\version "2.18.2"
\language "espanol"

\header{
  title = "Ejercicios de escalas mayores"
  tagline = ""
}

\relative {
 \accidentalStyle teaching
 \override AccidentalCautionary.parenthesized = ##f
 
 \set Staff.printKeyCancellation = ##f
 \override Staff.KeyCancellation.break-visibility = #all-invisible   
 \set Staff.extraNatural = ##f
 
  \tempo 4 = 60
  
 \key sib \major
  sib8^"Sib" do re mib fa sol la sib
  la sol fa mib re do sib4

  \key si \major
  si8^"Si" dos res mi fas sols las si
  las sols fas mi res dos si4
  
  \key do \major
  do8^"Do" re mi fa sol la si do
  si la sol fa mi re do4
}




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