At risk of repeating myself here, but it seems that what I said before has not been taken on board:
If you care to take the time to watch Dougie himself sing Caledonia on the numerous Youtubes of his live performances, you will see that SOMETIMES he sings SOMETIMES, and SOMETIMES he doesn't!!!!!
I don't think it's crucial whether you have SOMETIMES in or not - leave it on if it makes you feel happier: both versions would therefore seem to me to be equally correct, just as the "kissed the ladies" (early version) is as correct as the "kept on trying" (later version).
The bit that ISN'T correct as John Hill posted here as long ago as 1999, and several of us have done since, is the COAT-TAILS, and THAT definitely needs changing, AND THAT'S WHAT WE'VE BEEN ASKING YOU TO CHANGE.