A song can show chords in one key while its key signature says another. Transpose it anywhere and the chords come out in a key you did not ask for. This happens when the song was entered with the wrong key signature.

 

Open the song in the Editor and work out what key the chords are actually in. On iPhone, iPad and Android, tap Info (i), choose that key, then tap Set. On Mac and Windows, select that key at the bottom of the Editor panel and click Set.

 

Set changes the key signature without touching a single chord. For example, if the chords read as C but the Editor shows D, choose C and press Set.

 

It is worth fixing, because iReal Pro chooses its chord spellings by counting from the song's own key.

 

For the full guide, see Transpose a song on the iReal Pro website.